How many letters does the top answer for “complete metamorphosis in insects” have?

The most common answer is holometabolism (14 letters).

Crossword clue: complete metamorphosis in insects

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

holometabolism 14 letters wn-def

complete metamorphosis in insects

(of an insect) undergoing complete metamorphosis 75% similar → holometabolous

an insect which undergoes a metamorphosis. 50% similar → metabolian