How many letters does the top answer for “of or in or belonging to the cavity of the abdomen” have?

The most common answer is celiac (6 letters).

Crossword clue: of or in or belonging to the cavity of the abdomen

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

celiac 6 letters wn-def

of or in or belonging to the cavity of the abdomen

coeliac 7 letters wn-def

of or in or belonging to the cavity of the abdomen