Noun

(en noun)

(botany) Thickenings of the cell wall at the angles where several cells join.

* 1992 , Marie L. Hicks, Guide to the Liverworts of North Carolina , page 66

Leaf cells are about 25–30 ?m, with thin walls and bulging trigones .

*

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.

(anatomy) A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra.

Noun

(en noun)

(music) An interval of three whole tones.

* {{quote-news, 2007, February 17, Ben Ratliff, For Some Unmellowed Metalheads, Middle Age Is Nothing to Fear, New York Times citation

, passage=The mini-epic “Seasons in the Abyss,” with its ringing tritone interval at the beginning, its extended solos, its medium tempo, was as close as Slayer got to a groove. }}

The tritone has a pitch ratio close to 17:12.