from the GNU version of the Collaborative International Dictionary of English
- adj. a bivalve shell of the genus Tridacna, esp. T. gigas, which sometimes weighs 500 pounds. The shells are sometimes used in churches to contain holy water.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a large clam inhabiting reefs in the southern Pacific and weighing up to 500 pounds
Sorry, no etymologies found.