triquetrous

[ trahy-kwee-truh s, -kwe- ]

/ traɪˈkwi trəs, -ˈkwɛ- /

three-sided; triangular.

having a triangular cross section.

Origin of triquetrous

1650–60; < Latin triquetrus triangular, equivalent to tri- tri- + -quetrus cornered

sub·tri·que·trous, adjective

Triquetrous, sharply three-angled; and especially with the sides concave, like a bayonet.

The Elements of Botany |Asa Gray
Triquetrous, trī-kwet′rus, adj. three-sided: triangular—also Triquet′ral.

Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) |Various

triquetrous

/ (traɪˈkwiːtrəs, -ˈkwɛt-) /

triangular, esp in cross section a triquetrous stem

C17: from Latin triquetrus having three corners