'Grouper' definitions:

Definition of 'grouper'

noun

Flesh of a saltwater fish similar to sea bass

noun

Usually solitary bottom sea basses of warm seas

From: GCIDE

Grouper \Group"er\, n. [Corrupted fr. Pg. garupa crupper. Cf. Garbupa.] (Zool.) (a) One of several species of valuable food fishes of the genus Epinephelus, of the family Serranid[ae], as the red grouper, or brown snapper (Epinephelus morio), and the black grouper, or warsaw (Epinephelus nigritus), both from Florida and the Gulf of Mexico. (b) The tripletail (Lobotes). (c) In California, the name is often applied to the rockfishes. [Written also groper, gruper, and trooper.] [1913 Webster]

From: GCIDE

Triple-tail \Tri"ple-tail`\, n. (Zool.) An edible fish (Lobotes Surinamensis) found in the warmer parts of all the oceans, and common on the southern and middle coasts of the United States. When living it is silvery gray, and becomes brown or blackish when dead. Its dorsal and anal fins are long, and extend back on each side of the tail. It has large silvery scales which are used in the manufacture of fancy work. Called also, locally, black perch, grouper, and flasher. [1913 Webster]