semiannular

English

Etymology

From semi- +‎ annular.

Adjective

semiannular (not comparable)

1. Having a shape resembling part of a ring or incomplete circular band.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page 6:

     The capsule in both families is spherical, with a bistratose wall; the outer cell layer usually bears nodular thickenings […] ; the inner layer (of nearly equally large cells) lacks the regular semiannular or annular thickenings of most other leafy liverworts […]

Related terms

• annular