How many letters does the top answer for “failure of one testes to descend into the scrotum” have?

The most common answer is monorchidism (12 letters).

Crossword clue: failure of one testes to descend into the scrotum

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

monorchidism 12 letters wn-def

failure of one testes to descend into the scrotum

monorchism 10 letters wn-def

failure of one testes to descend into the scrotum