Lewis & Short

ăsărōtum, i, n., = ἀσάρωτον, a floor laid in mosaic, Stat. S. 1, 3, 36; cf.: asarotos oecos (= ἀσάρωτος οἶκος), Plin. 36, 25, 60, § 184; hence, asaroticus lapillus, a little mosaic stone, Sid. Carm. 23, 56.