xy

n. (Chem.) A gummy substance of the pentosan class, present in woody tissue, and yielding xylose on hydrolysis; wood gum. [ Webster 1913 Suppl. ]

n. [ Gr. xy`lon wood + 'a`nqrax coal. ] Wood coal, or charcoal; -- so called in distinction from mineral coal. [ 1913 Webster ]

pr. n. The type genus of the natural family Xylariaceae; fungi with perithecia in the upper part of erect black woody stromata.
Syn. -- genus Xylaria. [ WordNet 1.5 ]

pr. n. A natural family of fungi characterized by dark brown to back spores.
Syn. -- family Xylariaceae. [ WordNet 1.5 ]

n. (Chem.) A salt of xylic acid. [ 1913 Webster ]

n. [ Gr. xy`lon wood. ] (Bot.) That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloem. [ 1913 Webster ]

n. [ Gr. xy`lon wood. ] (Chem.) Any of a group of three metameric hydrocarbons of the aromatic series, found in coal and wood tar, and so named because found in crude wood spirit. They are colorless, oily, inflammable liquids, C6H4.(CH3)2, being dimethyl benzenes, and are called respectively orthoxylene, metaxylene, and paraxylene. Called also xylol. [ 1913 Webster ]

☞ Each of these xylenes is the nucleus and prototype of a distinct series of compounds. [ 1913 Webster ]

n. [ Xylene + -ol. ] (Chem.) Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH. [ 1913 Webster ]