How many letters does the top answer for “the eustachian tube, or the fallopian tube.” have?

The most common answer is salpinx (7 letters).

Crossword clue: the eustachian tube, or the fallopian tube.

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

salpinx 7 letters web-def

a tube in the uterus or the ear