IPA: /ɛmˈbriːənəl/
KK: /ɛmˈbrɪənəl/
Relating to an embryo, which is an early stage of development in living organisms.
The researchers studied the embryonal cells to understand early human development.
Embryonal is formed from "embryo" (from Greek "embryon", meaning a developing organism) and the suffix "-al" (meaning pertaining to). The word "embryonal" refers to something that pertains to an embryo or the early stages of development.
Think of an 'embryo' as a developing organism, and remember that 'embryonal' means related to that early stage of life.