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Webster 1913 Edition

Noun.

[

Xylo-

-yl

(Chem.)

Any one of three metameric radicals which are characteristic respectively of the three xylenes.

xylyl ‎(plural xylyls)

(organic chemistry) Any of several univalent radicals, of formula (CH₃)₂C₆H₃- derived from the three isomers of xylene: ortho-, meta- and para- (di-methyl benzene).