• Semiannular

    Origin

    From - + annular.

    Full definition of semiannular

    Adjective

    semiannular

    1. Having a shape resembling part of a ring or incomplete circular band.
      • Schuster Hepaticae V|6The 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

    © Wiktionary