Gi·ant, a. Like a giant; extraordinary in size, strength, or power; as, giant brothers; a giant son.
 Giant cell. Anat. See Myeloplax.
 Giant clam Zool., 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.
 Giant heron Zool., a very large African heron (Ardeomega goliath). It is the largest heron known.
 Giant kettle, a pothole of very large dimensions, as found in Norway in connection with glaciers. See Pothole.
 Giant powder. See Nitroglycerin.
 Giant puffball Bot., a fungus (Lycoperdon giganteum), edible when young, and when dried used for stanching wounds.
 Giant salamander Zool., a very large aquatic salamander (Megalobatrachus maximus), found in Japan. It is the largest of living Amphibia, becoming a yard long.
 Giant squid Zool., one of several species of very large squids, belonging to Architeuthis and allied genera. Some are over forty feet long.
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 giant clam
      n : giant clam inhabiting reefs in the southern Pacific weighing
          up to 500 pounds [syn: Tridacna gigas]