An Etymological Dictionary of Astronomy and Astrophysics

A mass of glass ready to be shaped into a telescope mirror. Same as → glass disk.

Etymology (EN): → glass; blank, from O.Fr. blanc “white, shining,” from Frank. *blank “white, gleaming,” of W.Gmc. origin (cf. O.E. blanca “white horse”), from P.Gmc. *blangkaz, from PIE *bhleg- “to shine.”

Etymology (PE): Gerdé, → disk; šišé→ glass.