How many letters does the top answer for “composed of, or containing, hypersthene.” have?

The most common answer is hypersthenic (12 letters).

Crossword clue: composed of, or containing, hypersthene.

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

hypersthenic 12 letters web-def

Composed of, or containing, hypersthene.

composed of or containing bone 50% similar → osseous, osteal

containing or composed of fat 50% similar → fatty

containing or composed of fossils. 50% similar → fossiliferous