triblet n. 心轴
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.