How many letters does the top answer for “of or relating to alchemy.” have?

The most common answer is alchemic (8 letters).

Crossword clue: of or relating to alchemy.

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

alchemic 8 letters web-def

related to or concerned with alchemy

alchemical 10 letters web-def

related to or concerned with alchemy

of or relating to words 50% similar → lexical