lactose Search Term: LactoseSource Category: ASSISTLactose is on the Recommended Chemicals list for Australian schools. Synonyms: 4-(β-D-galactosido)-D-glucose, β-D-Lactose, D-(+)-Lactose, milk sugar; CAS Number: 63-42-3; Signal Word: None. Tags: 63-42-34-(β-D-galactosido)-D-glucoseβ-D-LactoseD-(+)-Lactosemilk sugar