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plural trigones
(botany) One of the thickenings of the cell wall at the angles where several cells join. quotations examples
Leaf cells are about 25–30 μm, with thin walls and bulging trigones.
1992, Marie L. Hicks, Guide to the Liverworts of North Carolina, page 66
The epidermal cells of the capsule wall of Jubulopsis, with nodose "trigones" at the angles, are very reminiscent of what one finds in Frullania spp.
1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, pages 4-5
(anatomy) A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra; a similar region of a mitral valve examples