n. (Chem.) An alkaloid (C22H23NO7) found in small quantity in opium. It is identical with narcotine. It is present in amounts up to 11% in Papaver somniferum, and is used clinically as an antitussive. MI11
Syn. -- noscapine; narcosine; opian. [ 1913 Webster +PJC ]

a. [ Cf. F. opalin. ] Of, pertaining to, or like, opal in appearance; having changeable colors like those of the opal. [ 1913 Webster ]

n. 1. An opaline variety of yellow chalcedony. [ Webster 1913 Suppl. ]

2. Opal glass. [ Webster 1913 Suppl. ]

3. An opaline color or expanse. [ Webster 1913 Suppl. ]