Yellowbird :: Yellowbird (n.) The American goldfinch, or thistle bird. See Goldfinch..
Yellowbird :: Yellowbird (n.) The common yellow warbler; -- called also summer yellowbird. See Illust. of Yellow warbler, under Yellow, a..
Ytterbic :: Ytterbic (a.) Pertaining to, or derived from, ytterbium; containing ytterbium..
Ytterbium :: Ytterbium (n.) 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..