Definition of astrolabe

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as·tro·labe    (str-lb) KEY 

NOUN:

A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies.

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ETYMOLOGY:
Middle English astrelabie, from Old French astrelabe, from Medieval Latin astrolabium, from Greek astrolabon, planisphere : astro-, astro- + lambanein, lab-, to take