Proembryo

1. n. The primary growth from the spore in certain cryptogamous plants; as, the proembryo, or protonema, of mosses.
2. n. The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.