As a noun secundine is
(botany) the second coat, or integument, of an ovule, lying within the primine.
wikidiffcom
Not English
Wikidiffcom has no English definition. It may be misspelled. secundine
English
Noun
(
en noun)
(botany) The second coat, or integument, of an ovule, lying within the primine.
(chiefly, in the plural) The afterbirth, or placenta and membranes.
Usage notes
* (
botany) 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.
(
Webster 1913)