pyrene

noun

the stone of an apple, pear, or other drupe that contains several seeds

Etymology: ModL pyrena < Gr pyrēn, stone of a fruit, akin to pyros, grain of wheat < IE base *pūro-, cereal > furze

noun

a colorless hydrocarbon, CH, obtained from coal tar: its structure consists of the fusion of four benzene rings

Etymology: pyr- + -ene