Webster's Dictionary, 1913

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Placid adjective [ Latin placidus , originally, pleasing, mild, from placere to please: confer French placide . See Please .] Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle. "That placid aspect and meek regard." Milton. "Sleeping . . . the placid sleep of infancy." Macaulay.

Placidity noun [ Latin placiditas : confer French placidité .] The quality or state of being placid; calmness; serenity. Hawthorne.

Placidly adverb In a placid manner.

Placidness noun The quality or state of being placid.

Placit noun [ Latin placitum . See Plea .] A decree or determination; a dictum. [ Obsolete] "The placits and opinions of other philosophers." Evelyn.

Placitory adjective [ See Placit .] Of or pertaining to pleas or pleading, in courts of law. [ Obsolete] Clayton.

Placitum noun ; plural Placita . [ Late Latin See Placit .]
1. A public court or assembly in the Middle Ages, over which the sovereign president when a consultation was held upon affairs of state. Brande & C.

2. (Old Eng. Law) A court, or cause in court.

3. (Law) A plea; a pleading; a judicial proceeding; a suit. Burrill.

Plack noun [ French plaque a plate of metal. Confer Plaque .] A small copper coin formerly current in Scotland, worth less than a cent.

With not a plack in the pocket of the poet.
Prof. Wilson.

Placket noun [ French plaquer to lay or clap on. See Placard .]
1. A petticoat, esp. an under petticoat; hence, a cant term for a woman. [ Obsolete] Beau. & Fl.

2. The opening or slit left in a petticoat or skirt for convenience in putting it on; -- called also placket hole .

3. A woman's pocket.

Placoderm noun [ Greek ..., ..., tablet + ... skin.] (Paleon.) One of the Placodermi.

Placodermal adjective (Paleon.) Of or pertaining to the placoderms; like the placoderms.

Placodermata noun plural [ New Latin ] (Paleon.) Same as Placodermi .

Placodermi noun plural [ New Latin , from Greek ..., ..., a tablet + ... skin.] (Paleon.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys , and Coccosteus .

Placoganoid adjective (Zoology) Pertaining to the Placoganoidei.

Placoganoidei noun plural [ New Latin , from Greek ..., ..., a tablet + New Latin ganoidei . See Ganoidei .] (Zoology) A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.

Placoid adjective [ Greek ..., ..., a tablet + -oid .] (Zoology) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

Placoid noun (Zoology) (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.

Placoides noun plural [ New Latin ] (Zoology) A group of fishes including the sharks and rays; the Elasmobranchii; -- called also Placoidei .

Placoidian noun (Zoology) One of the placoids.

Placophora noun plural [ New Latin , from Greek ..., ..., tablet + ... to bear.] (Zoology) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora . See Illust. under Chiton , and Isopleura .

Plaga noun ; plural Plagæ . [ Latin plāga a blow, a welt, a stripe.] (Zoology) A stripe of color.

Plagal adjective [ French, from Greek ... sidewise, slanting.] (Mus.) Having a scale running from the dominant to its octave; -- said of certain old church modes or tunes, as opposed to those called authentic , which ran from the tonic to its octave.

Plagal cadence , a cadence in which the final chord on the tonic is preceded by the chord on the subdominant.

Plagate adjective (Zoology) Having plagæ, or irregular enlongated color spots.

Plage noun [ French, from Latin plaga .] A region; country. [ Obsolete] "The plages of the north." Chaucer.

Plagiarism noun [ Confer French plagiarisme .]
1. The act or practice of plagiarizing.

2. That which plagiarized.

Plagiarist noun One who plagiarizes; or purloins the words, writings, or ideas of another, and passes them off as his own; a literary thief; a plagiary.

Plagiarize transitive verb [ imperfect & past participle Plagiarized ; present participle & verbal noun Plagiarizing .] To steal or purloin from the writings of another; to appropriate without due acknowledgement (the ideas or expressions of another).

Plagiary intransitive verb To commit plagiarism.

Plagiary noun ; plural Plagiaries . [ Latin plagiarius a kidnaper, a literary thief, from plagium kidnaping; confer plaga a net, perhaps akin to English plait : confer French plagiaire .]
1. A manstealer; a kidnaper. [ Obsolete]

2. One who purloins another's expressions or ideas, and offers them as his own; a plagiarist. Dryden.

3. Plagiarism; literary thief. Milton.

Plagiary adjective
1. Kidnaping. [ Obsolete] E. Browne.

2. Practicing plagiarism. Bp. Hall.

Plagihedral adjective [ Greek ... oblique + ... base, seat.] (Crystallog.) Having an oblique spiral arrangement of planes, as levogyrate and dextrogyrate crystals.

Plagiocephalic adjective [ Greek ... oblique + ... the head.] (Anat.) Having an oblique lateral deformity of the skull.

Plagiocephaly noun (Anat.) Oblique lateral deformity of the skull.

Plagioclase noun [ Greek ... oblique + ... to break.] (Min.) A general term used of any triclinic feldspar. See the Note under Feldspar .

Plagionite noun [ Greek ... oblique. So called in allusion to its usually oblique crystallization.] (Min.) A sulphide of lead and antimony, of a blackish lead-gray color and metallic luster.

Plagiostomatous adjective (Zoology) Same as Plagiostomous .

Plagiostome noun (Zoology) One of the Plagiostomi.

Plagiostomi noun plural [ New Latin , from Greek ... slanting + ..., ..., mouth.] (Zoology) An order of fishes including the sharks and rays; -- called also Plagiostomata .

Plagiostomous adjective (Zoology) Of or pertaining to the Plagiostomi.

Plagiotremata noun plural ; [ New Latin , from Greek ... slanting + ..., ..., a hole.] (Zoology) Same as Lepidosauria .

Plagiotropic adjective [ Greek ... aslant + ... to turn.] (Botany) Having the longer axis inclined away from the vertical line.

Plagium noun [ Latin ] (Civil Law) Manstealing; kidnaping.

Plagose adjective [ Latin plagosus . See Plague .] Fond of flogging; as, a plagose master. [ R.]

Plague noun [ Latin plaga a blow, stroke, plague; akin to Greek ..., from ... to strike; confer Latin plangere to strike, beat. Confer Plaint .]
1. That which smites, wounds, or troubles; a blow; a calamity; any afflictive evil or torment; a great trail or vexation. Shak.

And men blasphemed God for the plague of hail.
Wyclif.

The different plague of each calamity.
Shak.

2. (Medicine) An acute malignant contagious fever, that often prevails in Egypt, Syria, and Turkey, and has at times visited the large cities of Europe with frightful mortality; hence, any pestilence; as, the great London plague . "A plague upon the people fell." Tennyson.

Cattle plague . See Rinderpest . -- Plague mark , Plague spot , a spot or mark of the plague; hence, a token of something incurable.

Plague transitive verb [ imperfect & past participle Plagued ; present participle & verbal noun Plaguing .]
1. To infest or afflict with disease, calamity, or natural evil of any kind.

Thus were they plagued
And worn with famine.
Milton.

2. Fig.: To vex; to tease; to harass.

She will plague the man that loves her most.
Spenser.

Syn. -- To vex; torment; distress; afflict; harass; annoy; tease; tantalize; trouble; molest; embarrass; perplex.

Plagueful adjective Abounding, or infecting, with plagues; pestilential; as, plagueful exhalations.

Plagueless adjective Free from plagues or the plague.

Plaguer noun One who plagues or annoys.

Plaguily adverb In a plaguing manner; vexatiously; extremely. [ Colloq.] "Ronsard is so plaguily stiff and stately." Landor.

Plaguy adjective Vexatious; troublesome; tormenting; as, a plaguy horse. [ Colloq.] Also used adverbially; as, "He is so plaguy proud." Shak.