The Collaborative International Dictionary of English v.0.48:

Limaceous \Li*ma"ceous\ (l[-i]*m[=a]"sh[u^]s), a. [L. limax,
   limacis, slug, snail: cf. F. limac['e].] (Zool.)
   Pertaining to, or like, Limax, or the slugs.
   [1913 Webster]