How many letters does the top answer for “of or relating to or involving the stomach and esophagus” have?

The most common answer is gastroesophageal (16 letters).

Crossword clue: of or relating to or involving the stomach and esophagus

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

gastroesophageal 16 letters wn-def

of or relating to or involving the stomach and esophagus

relating to or involving the stomach 75% similar → gastric, stomachic

of or relating to or involving the lungs and stomach 60% similar → pneumogastric

relating to the esophagus 50% similar → esophageal