The Collaborative International Dictionary
Thribble
Thribble \Thrib"ble\ (thr[i^]b"b'l), a.
Triple; treble; threefold. [Prov. Eng. or Colloq.]
--Halliwell.
Wiktionary
thribble
a. (label en obsolete) threefold n. A set of oil drilling pipes having three joints