anallantoidean
|an-al-lan-toi-de-an|
/ˌæn.ælˌænˈtɔɪ.di.ən/
lacking an allantois
Etymology
'anallantoidean' originates from Greek, specifically the prefix 'an-' meaning 'not' and 'allantois' meaning 'sausage-shaped' (referring to the embryonic membrane), with the suffix '-ean' forming an adjective or noun.
'anallantoidean' was formed in modern scientific English by combining Greek roots to describe organisms lacking an allantois.
Initially, it meant 'not having an allantois,' and this meaning has remained specific to embryology.
Meanings by Part of Speech
Noun 1
an organism or embryo that does not develop an allantois.
The turtle is considered an anallantoidean during certain stages of its development.
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Adjective 1
describing an embryo (especially of birds or reptiles) that does not develop an allantois (a particular embryonic membrane).
The anallantoidean embryos differ from those with an allantois in their development.
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Last updated: 2025/07/28 14:36