As an adjective embryonic
is (embryology) of or relating to an embryo.
As a noun protocorm is
(botany) a tuberous mass of cells that is the embryonic form of orchids and club mosses.
embryonic
English
Adjective
(
en adjective)
(embryology) Of or relating to an embryo.
(figuratively) Something, especially a project, that is very new and is still evolving; something that has yet to reach its full potential.
Synonyms
* embryonal (much less common )
protocorm
English
Noun
(
en noun)
(botany) A tuberous mass of cells that is the embryonic form of orchids and club mosses
*
References
*OED (online) 2007