crustaceous

adjective

of, relating to, having, or forming a crust or shell
crustacean

L1420860 on Wikidata ↗

Wiktionary

Pronunciation: /kɹʌsˈteɪʃəs/

adj

Resembling a crustacean.
“the crustaceous or ostreaceous body”
Hard, thin and brittle.
“a crustaceous lichen”