embrional

Embrional is an adjective used to describe things related to an embryo or to embryology. In English-language scientific writing, the more common form is embryonal, but embrional appears in some sources, especially in non-English texts or older literature. The term stems from the noun embryo, which originates from Greek embryon and related historical forms.

In practice, embrional is used to denote early developmental aspects tied to the embryo, such as embrional development or embrional tissues. It is associated with the embryonic period of development, a stage before the fetus becomes more definitively structured. In humans, this period covers the early weeks after fertilization, during which foundational organ systems begin to form. Many modern English texts prefer the term embryonic for events and structures up to around the end of the embryonic period.

In medicine, the root appears in various tumor names and developmental disorders, notably embryonal carcinoma and embryonal rhabdomyosarcoma. In those contexts, embrional spellings may be encountered in historical or non-English literature, but embryonal is the prevailing English spelling in contemporary usage. Overall, embrional can be viewed as a variant or cross-linguistic form of the more widely adopted embryonal, both conveying the relation to the embryo and early development.