- Triangular in cross section: the seeds are trigonousMore example sentences
- In superior view the fruits are markedly trigonous with three obtuse angles.
- One is African and supported by trigonous ovary in transverse section.
- Seeds are extremely small, being less than 1 mm in size, with a wide variety of shapes (ellipsoid, oblongoid, ovoid, globose, trigonous or tetragonous).
early 19th century: from Greek trigōnos (see trigon).