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A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium.

tic source. The ultimate origin is probably Egyptian. Etymologically, it is most closely related to s, y, and j; as in glass, glaze; E. yoke, Gr. yugum; E. zealous, jealous. See Guide to Pronunciation, §§ 273, 274.

A branch of algebra which relates to the direct search for unknown quantities. [R.]

n melting brass, is called also pompholyx, and tutty. -- Zinc spinel (Min.), a mineral, related to spinel, consisting essentially of the oxides of zinc and aluminium; gahnite. -- Zinc vitriol (Chem.), zinc sulphate. See White vitriol, under Vitriol. -- Zinc white, a white powder consisting of zinc oxide, used as a p…

That part of biology which relates to the animal kingdom, including the structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct.

lied to a division of birds which includes the barbets, toucans, honey guides, and other related birds.