- a putamen or stone, especially when there are several in a single fruit; a nutlet.
- a polycyclic, aromatic crystalline hydrocarbon, C16H10, consisting of four fused benzene rings, found in coal tar and believed to be carcinogenic.
- a solid polynuclear aromatic hydrocarbon extracted from coal tar. Formula: C 16 H 10
- any of several small hard stones that occur in a single fruit and contain a single seed each
