a telescope similar in design to the Cassegrainian telescope but less widely used.
a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror
- Gregorian tone
noun 1. a plainsong melody See tone (sense 6)
noun, Roman Catholic Church. 1. a mixture of water, salt, ashes, and wine, blessed and sprinkled over the altar in the consecration of a church.
- Gregorio lopez y fuentes
[law-pes ee fwen-tes] /ˈlɔ pɛs i ˈfwɛn tɛs/ noun 1. Gregorio [gre-gaw-ryaw] /grɛˈgɔ ryɔ/ (Show IPA), 1895–1966, Mexican writer.
- Gregor mendel
[men-dl] /ˈmɛn dl/ noun 1. Gregor Johann [greg-er yoh-hahn;; German grey-gawr yoh-hahn] /ˈgrɛg ər ˈyoʊ hɑn;; German ˈgreɪ gɔr ˈyoʊ hɑn/ (Show IPA), 1822–84, Austrian monk and botanist. 2. a male given name, form of . /ˈmɛndəl/ noun 1. Gregor Johann (ˈɡreːɡɔr joˈhan). 1822–84, Austrian monk and botanist; founder of the science of genetics. He […]