TRIDACNA
Tridacna, genus Tridacna
(noun) type genus of the family Tridacnidae: giant clams
Source: WordNet® 3.1
Etymology
From the genus name.
Noun
tridacna (plural tridacnas)
Any member of the genus Tridacna of large saltwater clams with heavy fluted shells.
Anagrams
• antacrid, cardiant, radicant
Source: Wiktionary
Tri*dac"na, n. Etym: [L., pl., a kind of oysters, fr. Gr. (Zoöl.)
Definition: A genus of very large marine bivalve shells found on the coral
reefs of the Indian and Pacific Oceans. One species (T. gigas) often
weighs four or five hundred pounds, and is sometimes used for
baptismal fonts. Called also paw shell, and fountain shell.
Source: Webster’s Unabridged Dictionary 1913 Edition