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Webster 1913 Edition

Noun.

[

Lac

tic + anhydride.]

(Chem.)

A white, crystalline substance, obtained from lactic acid by distillation, and regarded as an anhydride; also, by extension, any similar substance.

lactide ‎(plural lactides)

(organic chemistry) Any of a class of heterocyclic compounds, formally acid anhydrides, formed by heating α-lactones
(organic chemistry) The anhydride of lactic acid.