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From The Collaborative International Dictionary of English v.0.48:
Tripod \Tri"pod\, n. [L. tripus, -odis, Gr. ?; ? (see Tri-) + ?, ?, foot. See Foot, and cf. Tripos, Trivet.] 1. Any utensil or vessel, as a stool, table, altar, caldron, etc., supported on three feet. [1913 Webster] Note: On such, a stool, in the temple of Apollo at Delphi, the Pythian priestess sat while giving responses to those consulting the Delphic oracle. [1913 Webster] 2. A three-legged frame or stand, usually jointed at top, for supporting a theodolite, compass, telescope, camera, or other instrument. [1913 Webster] Tripod of life, or Vital tripod (Physiol.), the three organs, the heart, lungs, and brain; -- so called because their united action is necessary to the maintenance of life. [1913 Webster]