Definitions from Wiktionary (pyrene)

▸ noun:  (chemistry) A polycyclic aromatic hydrocarbon containing four fused benzene rings; first isolated from coal tar
▸ adjective:  (relational, obsolete) Of or pertaining to the Pyrenees, a range of mountains separating France and Spain; Pyrenean.
▸ noun:  (botany) Alternative form of pyrena [(botany) A nutlet resembling a seed, or the kernel/stone of a drupe.]
▸ Also see pyrene


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