How many letters does the top answer for “resembling a flower petal” have?

The most common answer is petaloid (8 letters).

Crossword clue: resembling a flower petal

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

petaloid 8 letters wn-def

resembling a flower petal

between the petals of a flower. 50% similar → interpetalary

(of flowers) having petals 50% similar → petaled, petalled, petalous

resembling a flower; flowerlike. 50% similar → anthoid