How many letters does the top answer for “any pathological hardening or thickening of tissue” have?

The most common answer is induration (10 letters).

Crossword clue: any pathological hardening or thickening of tissue

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

induration 10 letters wn-def

any pathological hardening or thickening of tissue

sclerosis 9 letters wn-def

any pathological hardening or thickening of tissue