lact-

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lact- stem of L. lac, lact- milk (cf. Gr. gála, galakt-; see GALAXY) in derivs.: lactation XVII(f. L. lactāre), lacteal XVII (f. L. lacteus), lacteous XVII, lactescent XVII (f. L. lactēscere), lactic (chem.) XVIII (whence lactate XVIII), lactiferous XVII, irreg. comb. form lacto- XIX, lactose XIX.

lact-

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lact- (lacti-, lacto-) combining form denoting
1. milk.

2. lactic acid.