An Etymological Dictionary of Astronomy and Astrophysics

Any tree of the genus Fagus, especially Fagus sylvatica of Europe, having smooth grayish bark. In Iran Fagus orientalis populates Caspian highland forests from Âstârâ to Gorgân.

Etymology (EN): M.E. beche, from O.E. becew; cf. Dutch beuk, Ger. Buche, from PIE root *bhagos “beech tree;” also cf.
Gk. phegos “oak,” L. fagus “beech,” Rus. buzina “elder.”

Etymology (PE): Râš, as named in Gilân, Râmsar, Šahsavâr, Kalârdašt. Its other names: (Mâzandarân) mers, (Ammaârlu, Manjil) râj, (Tevâleš, Mt. Dorfak) aluš, alâš, âlâš, (Nur) celer, celar (Iranica).