Triblet definitions

Webster's 1828 Dictionary

TRIB'LET
TRIBOM'ETER, n. [Gr. to rub or wear, and measure.] An instrument to ascertain the degree of friction.

Oxford Reference Dictionary

n. a mandrel used in making tubes, rings, etc. Etymology: F triboulet, of unkn. orig.

Webster's 1913 Dictionary

Triblet Trib"let, Tribolet Trib"o*let, n.] [F. triboulet.] 1. A goldsmith's tool used in making rings. --Ainsworth. 2. A steel cylinder round which metal is drawn in the process of forming tubes. --Tomlinson. 3. (Blacksmithing) A tapering mandrel.