coude-focus

cou·dé tel·escope

C c

Definition of coude-focus word

noun coude-focus a telescope in which light from the primary mirror is reflected along the polar axis to additional mirrors, and in which the focus (coudé focus) is independent of the telescope's motion, permitting the use of heavy instruments without disturbing the delicate balance of the telescope. 1

before 1920

One of the 12% newest English words

1920-25; < French coudé bent, elbowed, past participle of couder to bend, verbal derivative of coude elbow ≪ Latin cubitus cubit

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This term is known only to a narrow circle of people with rare knowledge. Only 29% of English native speakers know the meaning of this word.

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