Webster's Dictionary, 1913

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Yttrium noun [ New Latin , from Ytter by, in Sweden. See Erbium .] (Chemistry) A rare metallic element of the boron-aluminium group, found in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic weight, 89. [ Written also ittrium .]

» Associated with yttrium are certain rare elements, as erbium, ytterbium, samarium, etc., which are separated in a pure state with great difficulty. They are studied by means of their spark or phosphorescent spectra. Yttrium is now regarded as probably not a simple element, but as a mixture of several substances.

Yttro-cerite noun (Min.) A mineral of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cerium, yttrium, and calcium.

Yttro-columbite, Yttro-tantalite noun (Min.) A tantalate of uranium, yttrium, and calcium, of a brown or black color.

Yu noun [ Chin.] (Min.) Jade.

Yucca noun (Zoology) See Flicker , noun , 2.

Yucca noun [ New Latin , from Yuca , its name in St. Domingo.] (Botany) A genus of American liliaceous, sometimes arborescent, plants having long, pointed, and often rigid, leaves at the top of a more or less woody stem, and bearing a large panicle of showy white blossoms.

» The species with more rigid leaves (as Yucca aloifolia , Y. Treculiana , and Y. baccata ) are called Spanish bayonet , and one with softer leaves ( Y. filamentosa ) is called bear grass , and Adam's needle .

Yucca moth (Zoology) , a small silvery moth ( Pronuba yuccasella ) whose larvæ feed on plants of the genus Yucca.

Yucca borer (a) A California boring weevil ( Yuccaborus frontalis ). (b) A large mothlike butterfly ( Megathymus yuccæ ) of the family Megatimidæ , whose larva bores in yucca roots.

Yuck intransitive verb [ Confer German jucken , Dutch yeuken , joken . See Itch .] To itch. [ Prov. Eng.] Grose.

Yuck transitive verb To scratch. [ Prov. Eng.] Wright.

Yuckel noun (Zoology) Same as Yockel .

Yuen noun (Zoology) The crowned gibbon ( Hylobates pileatus ), native of Siam, Southern China, and the Island of Hainan. It is entirely arboreal in its habits, and has very long arms. the males are dark brown or blackish, with a caplike mass of long dark hair, and usually with a white band around the face. The females are yellowish white, with a dark spot on the breast and another on the crown. Called also wooyen , and wooyen ape .

Yufts noun [ Russian iufte .] Russia leather.

Yug Yu"ga noun [ Sanskrit yuga an age, a yoke. See Yoke .] (Hindoo Cosmog.) Any one of the four ages, Krita , or Satya , Treta , Dwapara , and Kali , into which the Hindoos divide the duration or existence of the world.

Yuke intransitive verb & t. Same as Yuck . [ Prov. Eng.]

Yulan noun (Botany) A species of Magnolia ( M. conspicua ) with large white blossoms that open before the leaves. See the Note under Magnolia .

Yule noun [ Middle English yol , ʒol , Anglo-Saxon geól ; akin to geóla December or January, Icelandic jōl Yule, Ylir the name of a winter month, Swedish jul Christmas, Danish juul , Goth. jiuleis November or December. Confer Jolly .] Christmas or Christmastide; the feast of the Nativity of our Savior.

And at each pause they kiss; was never seen such rule
In any place but here, at bonfire, or at Yule .
Drayton.

Yule block , or Yule log , a large log of wood formerly put on the hearth of Christmas eve, as the foundation of the fire. It was brought in with much ceremony. -- Yule clog , the yule log. Halliwell. W. Irving.

Yuletide noun Christmas time; Christmastide; the season of Christmas.

Yuman adjective Designating, or pertaining to, an important linguistic stock of North American Indians of the southwestern United States and northwestern Mexico, nearly all agriculturists and adept potters and basket makers. Their usual dwelling is the brush wikiup, and in their native state they wear little clothing. The Yuma, Maricopa, Mohave, Walapi, and Yavapai are among the chief tribes, all of fine physique.

Yumas noun plural ; sing. Yuma (Ethnol.) A tribe of Indians native of Arizona and the adjacent parts of Mexico and California. They are agricultural, and cultivate corn, wheat, barley, melons, etc.

» The a wider sense, the term sometimes includes the Mohaves and other allied tribes.

Yunca (yōn"kȧ) noun An Indian of a linguistic stock of tribes of the Peruvian coast who had a developed agricultural civilization at the advent of the Spaniards, before which they had been conquered by the Incas. They constructed irrigation canals which are still in use, adorned their buildings with bas-reliefs and frescoes, and were skilled goldsmiths and silversmiths. -- Yun"can adjective

Yunx (yŭnks) noun [ New Latin , from Greek 'i`ygx the wryneck.] (Zoology) A genus of birds comprising the wrynecks.

Yupon noun (Botany) Same as Yaupon .

Yux noun & v. See Yex , noun [ Obsolete]

Yvel adjective & adverb Evil; ill. [ Obsolete] Chaucer.

Ywar adjective [ See Aware .] Aware; wary. [ Obsolete] "Be ywar , and his way shun." Piers Plowman.

Ywis adverb [ Middle English ywis , iwis , Anglo-Saxon gewis certain; akin to Dutch gewis , German gewiss , and English wit to know. See Wit to know, and Y- .] Certainly; most likely; truly; probably. [ Obsolete or Archaic]

" Ywis ," quod he, "it is full dear, I say."
Chaucer.

She answered me, " I-wisse , all their sport in the park is but a shadow to that pleasure that I find in Plato."
Ascham.

A right good knight, and true of word ywis .
Spenser.

» The common form iwis was often written with the prefix apart from the rest of the word and capitalized, as, I wis , I wisse , etc. The prefix was mistaken for the pronoun, I and wis , wisse , for a form of the verb wit to know. See Wis , and confer Wit , to know.

Our ship, I wis ,
Shall be of another form than this.
Longfellow.