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[proh-see-on] /ˈproʊ siˌɒn/
noun, Astronomy.
a first-magnitude star in the constellation Canis Minor.
Origin of Procyon
1650-60; < Latin < Greek Prokýōn name of a star, equivalent to pro- pro-2 + kýōn dog (see hound1); so called because it rises just before Sirius, the Dog Star Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for Procyon


the brightest star in the constellation Canis Minor, a binary with a very faint companion. Visual magnitude: 0.34; spectral type: F5IV; distance: 114 light years
Word Origin
C17: via Latin from Greek Prokuōn literally: before the Dog, from pro-² + kuōn dog; so named because it rises just before Sirius, the Dog Star
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for Procyon

bright star in constellation Canis Minoris, 1650s, from Latin, from Greek prokyon, from pro "before" (see pro-) + kyon "dog" (see canine (n.)); so called from its rising just before the "Dog Star," Sirius. By Roman astronomers, sometimes Latinized as Antecanis.

Online Etymology Dictionary, © 2010 Douglas Harper
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Procyon in Science
A very bright binary star in the constellation Canis Minor, with an apparent magnitude of 0.34. Scientific name: Alpha Canis Minoris.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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