How many letters does the top answer for “without, or not developing, an allantois.” have?

The most common answer is anallantoic (11 letters).

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Crossword clue: without, or not developing, an allantois.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

anallantoic 11 letters web-def

Without, or not developing, an allantois.

Pattern

without, or not developing, an amnion. 60% similar → anamniotic

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)