Crossword clue: one of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, c16h10.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it