Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. alsĭus or alsus, a, um, adj. [algeo], chilly, cold, cool (only once in Lucr. and twice in Cic.): alsia corpora, cold bodies, Lucr. 5, 1015.
The form alsus only in the comp. neutr.: Antio nihil quietius, nihil alsius, nihil amoenius, Cic. Att. 4, 8: Jam ἀποδυτηρίῳ nihil alsius, nihil muscosius, id. Q. Fr. 3, 1; cf Rudd. I. p. 179, n. 52.