How many letters does the top answer for “living within a living animal usually as a parasite” have?

The most common answer is endozoic (8 letters).

Crossword clue: living within a living animal usually as a parasite

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

endozoic 8 letters wn-def

living within a living animal usually as a parasite

entozoan 8 letters wn-def

any of various parasites that live in the internal organs of animals (especially intestinal worms)

entozoic 8 letters wn-def

living within a living animal usually as a parasite