[ 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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for procyon

British Dictionary definitions for procyon


/ (ˈprəʊsɪən) /


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 for Procyon

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

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

Science definitions for procyon


[ prōsē-ŏn′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.