[tri.que.trous] adj [L triquetrus three-cornered, fr. tri- + -quetrus; prob. akin to OHG waz sharp--more at whet] (ca. 1879): having three acute angles "~ stems"
TRIQUETROUS
Meaning of TRIQUETROUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012