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The Collaborative International Dictionary
Carapax

Carapax \Car"a*pax\, n. (Zo["o]l.) See Carapace.

Wiktionary
carapax

n. (context zoology English) (alternative form of carapace English)

Wikipedia
Carapax

Carapax is a fictional supervillain published by DC Comics. Carapax first appeared in Blue Beetle (vol. 1) #1 (June 1986), and was created by Len Wein and Paris Cullins. Carapax is featured as the archenemy of Blue Beetle.