How many letters does the top answer for “excision of the vermiform appendix.” have?

The most common answer is appendectomy (12 letters).

Crossword clue: excision of the vermiform appendix.

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

appendectomy 12 letters web-def

surgical removal of the vermiform appendix

appendicectomy 14 letters web-def

surgical removal of the vermiform appendix

inflammation of the vermiform appendix 50% similar → appendicitis