Pertaining to, or of the nature of, crust or shell; having a crustlike shell.
2.
(Zool.)
Belonging to the Crustacea; crustacean.
Webster 1828 Edition
Crustaceous
CRUSTACEOUS
,
Adj.
[L.] Pertaining to crust; like crust; of the nature of crust or shell. Crustaceous animals, or Crustacea, have a crust or shell composed of several jointed pieces, and in their external form have a great resemblance to insects; but in their internal structure and economy, they are quite different. They were arranged by Linne, in the same class with the insects, but now form a class by themselves. They include the crab, lobster, shrimp, &c.