/bel"euhm nuyt'/ , n. Paleontol.
a conical fossil, several inches long, consisting of the internal calcareous rod of an extinct animal allied to the cuttlefish; a thunderstone.
[ 1640-50; bélemnite, equiv. to Gk bélemn ( on ) a dart (n. deriv. from base of bállein to throw) + F -ite -ITE 1 ]