American Heritage® Dictionary of the English Language, Fourth Edition
- n. A constellation in the Southern Hemisphere.
Century Dictionary and Cyclopedia
- n. A constellation south of Capricorn, introduced by Lacaille in 1752.
- n. astronomy A faint constellation of the southern spring sky, said to resemble a microscope. It lies south of the constellation of Capricornus.
- n. a faint constellation in the southern hemisphere near Sagittarius and Capricornus
- Named by the French astronomer Nicolas Louis de Lacaille in 1763. From later Latin microscopium, a "microscope" (Wiktionary)
- New Latin Mīcroscopium, microscope, Microscopium : micro- + -scopium, -scope. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Microscopium', the question is settled in physics; but whether in metaphysics, is not quite so clear.”
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