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From The Collaborative International Dictionary of English v.0.48:
Coelospermous \C[oe]l`o*sper"mous\ (? or ?), a. [Gr. koi^los hollow + ? seed.] (Bot.) Hollow-seeded; having the ventral face of the seedlike carpels incurved at the ends, as in coriander seed. [1913 Webster]