How many letters does the top answer for “having two or more nuclei” have?

The most common answer is multinucleate (13 letters).

Crossword clue: having two or more nuclei

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

multinucleate 13 letters wn-def

having two or more nuclei

having many eyes, or more than two. 50% similar → multocular

having two nuclei; as, binucleate cells. 50% similar → binuclear

having two or more broods in a season. 50% similar → polygoneutic