among the largest bony fish; pelagic fish having an oval
compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters Synonym(s):ocean sunfish, sunfish, mola, headfish
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Headfish \Head`fish"\, n. (Zo[94]l.)
The sunfish ({Mola}).