How many letters does the top answer for “the second compartment of the stomach of a ruminant” have?

The most common answer is reticulum (9 letters).

Crossword clue: the second compartment of the stomach of a ruminant

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

reticulum 9 letters wn-def

the second compartment of the stomach of a ruminant

the third compartment of the stomach of a ruminant 60% similar → omasum, psalterium