any coral of the genus Heliopora, having brown polyps and a blue skeleton, found in the Indo-Pacific region.
an edible crab, Callinectes sapidus, having a dark green body and bluish legs, found along the Atlantic and Gulf coasts of North America.
the great blue heron.
a nonprofit organization that offers its members health insurance covering hospitalization, surgical, and medical expenses.
(used with a singular or plural verb) any of several plants belonging to the genus Trichostema, of the mint family, having blue to pink or, rarely, white flowers with long, curved filaments. selfheal (def 1). Historical Examples Woodland Tales Ernest Seton-Thompson