[sig-nuh s]

noun, genitive Cyg·ni [sig-nahy] /ˈsɪg naɪ/. Astronomy.

the Swan, a northern constellation southwest of Draco, containing the bright star Deneb.

Origin of Cygnus

< Latin: swan; see cygnet Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cygni

Historical Examples of cygni

  • Stellar parallax was first securely detected in 1838, by Bessel, for 61 Cygni.

  • The two nearest fixed stars are Alpha Centauri and 61 Cygni.

  • Latitude by observation a Cygni 14 degrees 51 minutes 37 seconds.

  • One star, known as 61 Cygni, was then and is now rushing along at the rate of 100 miles every second.

  • Alpha Centauri, then, is four and one-third light-years distant, and 61 Cygni seven and one-fifth light-years away.


    David Todd

British Dictionary definitions for cygni


noun Latin genitive Cygni (ˈsɪɡnaɪ)

a constellation in the N hemisphere lying between Pegasus and Draco in the Milky Way. The constellation contains the Cygnus Loop supernova remnant, the intense radio galaxy Cygnus A, and the intense galactic X-ray source Cygnus X–1, which is probably a black hole

Word Origin for Cygnus

Latin: swan; see cygnet
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

cygni in Science



A constellation in the Northern Hemisphere near Cepheus and Lyra. Cygnus (the Swan, or the Northern Cross) contains the bright star Deneb.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.