Tri·dac·na n. Zool. A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (Tridacna gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Called also paw shell, and fountain shell.
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Foun·tain n.
1. A spring of water issuing from the earth.
2. An artificially produced jet or stream of water; also, the structure or works in which such a jet or stream rises or flows; a basin built and constantly supplied with pure water for drinking and other useful purposes, or for ornament.
3. A reservoir or chamber to contain a liquid which can be conducted or drawn off as needed for use; as, the ink fountain in a printing press, etc.
4. The source from which anything proceeds, or from which anything is supplied continuously; origin; source.
Judea, the fountain of the gospel. --Fuller.
Author of all being,
Fountain of light, thyself invisible. --Milton.
Air fountain. See under Air.
Fountain heead, primary source; original; first principle. --Young.
Fountain inkstand, an inkstand having a continual supply of ink, as from elevated reservoir.
Fountain lamp, a lamp fed with oil from an elevated reservoir.
Fountain pen, a pen with a reservoir in the handle which furnishes a supply of ink.
Fountain pump. (a) A structure for a fountain, having the form of a pump. (b) A portable garden pump which throws a jet, for watering plants, etc.
Fountain shell Zool., the large West Indian conch shell (Strombus gigas).
Fountain of youth, a mythical fountain whose waters were fabled to have the property of renewing youth.
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