maksutov-telescope

Mak·su·tov tel·escope

[mak-soo-tawf, -tof]
noun
a reflecting telescope in which coma and spherical aberration are reduced to a minimum by a combination of a spherical mirror and a meniscus lens placed inside the radius of curvature of the mirror.

Origin:
after Russian opticist Dmitriĭ Dmitrievich Maksutov (1896–1964), who designed such a telescope in 1941

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WordNet
maksutov telescope

noun
reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Maksutov-telescope is always a great word to know.
So is ninnyhammer. Does it mean:
a scrap or morsel of food left at a meal.
a fool or simpleton; ninny.
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