Etymology
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astrolabe (n.)

"instrument for measuring the altitude of the sun and stars," mid-14c., from Old French astrelabe, from Medieval Latin astrolabium, from Greek astrolabos (organon) "star-taking (instrument)," from astron "star" (from PIE root *ster- (2) "star") + lambanien "to take" (see lemma).

updated on April 24, 2017

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Definitions of astrolabe from WordNet

astrolabe (n.)
an early form of sextant;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.