giant

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person or thing of great size.
• noun A person or thing of extraordinary power, significance, or importance.
• noun Greek Mythology One of a race of humanlike beings of enormous strength and stature who were destroyed in battle with the Olympians.
• noun A being in folklore or myth similar to one of these beings.
• noun A gymnastic maneuver in which the body is swung, fully extended, around a horizontal bar.
• adjective Marked by exceptionally great size, magnitude, or power.

from The Century Dictionary.

• noun In gold-mining, a large nozle used to direct the powerful streams employed in hydraulic work. See cut under hydraulic.
• noun In classical mythology, one of a divine but monstrous race, children of Uranus (Heaven) and Gæa (Earth), and personifying destructive physical phenomena, as those of volcanic origin.
• noun Some other imaginary being of human form but superhuman size: as, Giant Despair, in Bunyan's “Pilgrim's Progress.”
• noun Figuratively, a person of unusual size or of extraordinary powers, physical or mental.
• Gigantic; of extraordinary size or force, actual or relative: as, “the giant world,” ; a giant intellect.

from the GNU version of the Collaborative International Dictionary of English.

• noun A man of extraordinari bulk and stature.
• noun A person of extraordinary strength or powers, bodily or intellectual.
• noun Any animal, plant, or thing, of extraordinary size or power.
• noun a vast collection of basaltic pillars, in the county of Antrim on the northern coast of Ireland.
• adjective Like a giant; extraordinary in size, strength, or power
• adjective (Anat.) See Myeloplax.
• adjective (Zoöl.) 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.
• adjective (Zoöl.) a very large African heron (Ardeomega goliath). It is the largest heron known.
• adjective a pothole of very large dimensions, as found in Norway in connection with glaciers. See Pothole.
• adjective See Nitroglycerin.
• adjective (Bot.) a fungus (Lycoperdon giganteum), edible when young, and when dried used for stanching wounds.
• adjective (Zoöl.) a very large aquatic salamander (Megalobatrachus maximus), found in Japan. It is the largest of living Amphibia, becoming a yard long.
• adjective (Zoöl.) one of several species of very large squids, belonging to Architeuthis and allied genera. Some are over forty feet long.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A mythical human of very great size
• noun mythology Specifically, any of the Gigantes, the race of giants in the Greek mythology.
• noun A very tall person.
• noun A tall species of a particular animal or plant.
• noun astronomy A star that is considerably more luminous than a main sequence star of the same temperature (eg. red giant, blue giant).
• noun computing An Ethernet packet that exceeds the medium's maximum packet size of 1,518 bytes.
• noun A very large organisation.
• adjective very large

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a very large person; impressive in size or qualities
• noun someone or something that is abnormally large and powerful
• noun a person of exceptional importance and reputation
• noun an unusually large enterprise
• adjective of great mass; huge and bulky
• noun any creature of exceptional size
• noun an imaginary figure of superhuman size and strength; appears in folklore and fairy tales
• noun a very bright star of large diameter and low density (relative to the Sun)