Exostome

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Exostome \Ex"o*stome\, n. [Exo- + Gr. ? mouth :cf. F. exostome.]
     (Bot.)
     The small aperture or foremen in the outer coat of the ovule
     of a plant.
     [1913 Webster]