How many letters does the top answer for “a medicine which excites action in the stomach; a cardial.” have?

The most common answer is cardiac (7 letters).

Crossword clue: a medicine which excites action in the stomach; a cardial.

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

cardiac 7 letters web-def

of or relating to the heart