Having or possessing an amnion; describing vertebrates whose embryos develop within an amniotic membrane.
From amnion plus the adjectival suffix -ate. Related to the noun amnionata, describing the presence of this embryonic membrane.
The evolution of the amnion was revolutionary—once vertebrates got this waterproof wrap for their babies, they could leave the ocean entirely, which is why land animals conquered every environment on Earth.
Complete word intelligence in one call. Free tier — 50 lookups/day.