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plural setas or setae or setæ
A bristle or hair examples
(botany) The stalk of a moss sporangium, or occasionally in a liverwort. quotations examples
The latter has the sporophyte seta 4 cells in diam. and has thecal Lejeunea-type androecial branches […]
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, page 6