Definitions

1. noun

A type of wasp, particularly one of the family Vespidae, that is a female that has developed ovipositors but lacks a stinger.

“The scientist studied the behavior of a trigonid in its natural habitat.”

2. noun

In botany, a trigonid refers to a part of a seed that is the remnant of the nucellus.

“The student examined the trigonid of the seed under a microscope.”