an animal of the Crustacea, 1835; see Crustacea + -an. As an adjective, "of or pertaining to an animal of the Crustacea," 1858 (an earlier adjective was crustaceous, "pertaining to crust, crust-like," 1640s).
Entries linking to crustacean
Crustacea n.
arthropod class, 1814, Modern Latin neuter plural of crustaceus (animalia), literally "having a crust or shell," from Latin crusta "crust, rind, bark, hard shell" (from PIE root *kreus- "to begin to freeze, form a crust;" also see -a (2)). Taken as a zoological classification by Lamarck, 1801; Cuvier (1798) had les insectes crustacées.
-an
word-forming element meaning "pertaining to," from Latin -anus, adjective suffix, in some cases via French -ain, -en. From PIE *-no-.
*kreus-
Proto-Indo-European root meaning "to begin to freeze, form a crust."
It forms all or part of: crouton; crust; Crustacea; crustacean; cryo-; cryogenic; crystal; crystalline; crystallize; custard; encrust; Kristallnacht.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit krud- "make hard, thicken;" Avestan xruzdra- "hard;" Greek krystallos "ice, crystal," kryos "icy cold, frost;" Latin crusta "rind, crust, shell, bark;" Lettish kruwesis "frozen mud;" Old High German hrosa "ice, crust;" Old English hruse "earth;" Old Norse hroðr "scurf."