Source : Webster's Revised Unabridged Dictionary (1913)

Calamar \Cal"a*mar\ (k[a^]l"[.a]*m[aum]r), Calamary
\Cal"a*ma*ry\, (-m[asl]*r[y^]r)n. [LL. calamarium inkstand, fr.
   L. calamus a reed pen: cf. F. calmar, calemar, pen case,
   calamar.] (Zo["o]l.)
   A cephalopod, belonging to the genus {Loligo} and related
   genera. There are many species. They have a sack of inklike
   fluid which they discharge from the siphon tube, when pursued
   or alarmed, in order to confuse their enemies. Their shell is
   a thin horny plate, within the flesh of the back, shaped very
   much like a quill pen. In America they are called {squids}.
   See {Squid}.