Webster's Dictionary, 1913

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Onomatologist noun One versed in the history of names. Southey.

Onomatology noun [ Greek ..., ... + -logy .] The science of names or of their classification.

Onomatopœia noun [ Latin , from Greek ...; ..., ..., a name + ... to make.] (Philol.) The formation of words in imitation of sounds; a figure of speech in which the sound of a word is imitative of the sound of the thing which the word represents; as, the buzz of bees; the hiss of a goose; the crackle of fire.

» It has been maintained by some philologist that all primary words, especially names, were formed by imitation of natural sounds.

Onomatopœic adjective Onomatopoetic. Whitney.

Onomatope noun [ See Onomatopœia .] An imitative word; an onomatopoetic word.

Onomatopoetic adjective Of or pertaining to onomatopœia; characterized by onomatopœia; imitative; as, an onomatopoetic writer or word. Earle.

Onomatopy noun Onomatopœia.

Onomomancy noun See Onomancy .

Onondagas noun plural ; sing. Onondaga (Ethnol.) A tribe of Indians formerly inhabiting what is now a part of the State of New York. They were the central or head tribe of the Five Nations.

Onrush noun A rushing onward.

Onset noun [ On + set .]
1. A rushing or setting upon; an attack; an assault; a storming; especially, the assault of an army. Milton.

The onset and retire
Of both your armies.

Who on that day the word of onset gave.

2. A setting about; a beginning. [ Obsolete] Shak.

There is surely no greater wisdom than well to time the beginnings and onsets of things.

3. Anything set on, or added, as an ornament or as a useful appendage. [ Obsolete] Johnson.

Onset transitive verb
1. To assault; to set upon. [ Obsolete]

2. To set about; to begin. [ Obsolete] Carew.

Onslaught noun [ Middle English on on + slaught , slaht , slaughter. See Slaughter .]
1. An attack; an onset; esp., a furious or murderous attack or assault.

By storm and onslaught to proceed.

2. A bloody fray or battle. [ Scot.] Jamieson.

Onstead noun [ Possibly a corruption of homestead .] A single farmhouse; a steading. [ Prov.Eng. & Scot.] Grose. Jamieson.

Onto preposition [ On + to . Confer Into .] On the top of; upon; on. See On to , under On , preposition

Ontogenesis, Ontogeny noun [ See Ontology , and Genesis .] (Biol.) The history of the individual development of an organism; the history of the evolution of the germ; the development of an individual organism, -- in distinction from phylogeny , or evolution of the tribe. Called also henogenesis , henogeny .

Ontogenetic adjective (Biol.) Of or pertaining to ontogenesis; as, ontogenetic phenomena. -- On`to*ge*net"ic*al*ly adverb

Ontogenic adjective (Biol.) Ontogenetic.

Ontologic adjective Ontological.

Ontological adjective [ Confer French ontologique .] Of or pertaining to ontology.

Ontologically adverb In an ontological manner.

Ontologist noun [ Confer F. ontologiste .] One who is versed in or treats of ontology. Edin. Rev.

Ontology noun [ Greek ... the things which exist (pl.neut. of ..., ..., being, present participle of ... to be) + - logy : confer French ontologie .] That department of the science of metaphysics which investigates and explains the nature and essential properties and relations of all beings, as such, or the principles and causes of being.

Onus noun [ Latin ] A burden; an obligation.

Onward adjective
1. Moving in a forward direction; tending toward a contemplated or desirable end; forward; as, an onward course, progress, etc.

2. Advanced in a forward direction or toward an end.

Within a while, Philoxenus came to see how onward the fruits were of his friend's labor.
Sir P. Sidney.

Onward adverb Toward a point before or in front; forward; progressively; as, to move onward .

Not one looks backward, onward still he goes.

Onwardness noun Progress; advancement.

Onwards adverb [ See -wards .] Onward.

Ony adjective Any. [ Obsolete] Chaucer.

On"y*cha noun [ New Latin , from Latin onyx , -ychis , onyx, also, a kind of mussel, Greek ..., .... See Onyx .]

1. An ingredient of the Mosaic incense, probably the operculum of some kind of strombus. Ex. xxx. 34.

2. The precious stone called onyx . [ R.]

Onychia noun [ New Latin See Onyx .] (Medicine) (a) A whitlow. (b) An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.

Onychomancy noun [ Greek ..., ..., a finger nail + -mancy : confer French onychomancie .] Divination by the nails.

Onychophora noun plural [ New Latin , from Greek ..., ..., a claw + ....] (Zoology) Malacopoda.

Onyx noun [ Latin , from Greek ... a claw, finger nail, a veined gem. See Nail , and confer Onycha .] (Min.) Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground.

Onyx marble , a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico.

Oo adjective One. [ Obsolete] Chaucer.

Ooidal adjective [ Greek ...; w,'o`n an egg + ... form.] (Biol.) Shaped like an egg.

Ook noun Oak. [ Obsolete] "A branched ook ." Chaucer.

Oolong noun [ Chinese, green dragon.] A fragrant variety of black tea having somewhat the flavor of green tea. [ Written also oulong .]

Oomiac, Oomiak noun A long, broad boat used by the Eskimos.

Oon adjective One. [ Obsolete] Chaucer.

Oones adverb Once. [ Obsolete] Chaucer.

Oop transitive verb [ Etymol. uncertain.] To bind with a thread or cord; to join; to unite. [ Scot.] Jamieson.

Oopack, Oopak noun [ So named from a district in China.] A kind of black tea.