“Pezzottaite is trigonal, whereas the other members of the beryl group are hexagonal.”

“In this case, the c-axis, or axis of trigonal symmetry, is vertical with respect to the organic substrate and hence to the wall itself.”

“In an associative transition state a penta-coordinated phosphorus atom would be formed, in a dissociative transition a trigonal metaphosphate.”

“In superior view the fruits are markedly trigonous with three obtuse angles.”

“It is very much flattened in paspalum scrobiculatum, but somewhat trigonous in Digitaria sanguinalis.”

“Grain is oblong, obtusely trigonous, or concavo-convex, red-brown and rugulose on the ventral side.”