How many letters does the top answer for “resembling glass in transparency or translucency” have?

The most common answer is hyaline (7 letters).

Crossword clue: resembling glass in transparency or translucency

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

hyaline 7 letters wn-def

a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions

hyaloid 7 letters wn-def

the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina