from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. trigonal
from the GNU version of the Collaborative International Dictionary of English
- adj. Same as trigonal.
from The Century Dictionary and Cyclopedia
- Same as trigonal.
- In botany, three-angled; having three prominent longitudinal angles, as a stem or an ovary. Also trigonal.
Latin trigonus, from Ancient Greek. (Wiktionary)