Adjective identifying the third surface to reflect radiation in a telescope In a radio telescope, the primary reflector is usually the surface of the panels or, in a low-frequency antenna, a wire mesh This is sometimes referred to as the main reflector or simply, the dish The secondary reflector, if any, is often called the subreflector While smaller than the primary reflector, it is often large relative to a person By contrast, any tertiary reflector is usually a small device used only at high radio frequencies and which is often therefore described as a "mirror", by analogy with optical systems
A high level of wastewater treatment that repurifies the water to meet state health requirements
The first period of the Cenozoic era (after the Cretaceous of the Mesozoic era and before the Quaternary) thought to have covered the span of time between 65 and 2 Ma; also, the corresponding system of rocks
(3) Geology Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the first period of the Cenozoic Era, extending from the Cretaceous Period of the Mesozoic Era to the Quaternary Period of the Cenozoic Era, characterized by the appearance of modern flora and of apes and other large mammals Donkey - Equus asinus [Back To Top]
Tertiary means third in order, third in importance, or at a third stage of development. He must have come to know those philosophers through secondary or tertiary sources