from
The Collaborative International Dictionary of English v.0.48
Secundine \Sec"un*dine\, n. [Cf. F. secondine.]
1. (Bot.) The second coat, or integument, of an ovule, lying
within the primine.
[1913 Webster]
Note: In the ripened seed the primine and secundine are
usually united to form the testa, or outer seed coat.
When they remain distinct the secundine becomes the
mesosperm, as in the castor bean.
[1913 Webster]
2. [Cf. F. secondines.] The afterbirth, or placenta and
membranes; -- generally used in the plural.
[1913 Webster]