[ see-fee-uh s, -fyoos ]
/ ˈsi fi əs, -fyus /

noun, genitive Ce·phe·i [see-fee-ahy] /ˈsi fiˌaɪ/ for 1.

Astronomy. a northern circumpolar constellation between Cassiopeia and Draco.
Also Kepheus. Classical Mythology. an Ethiopian king, the husband of Cassiopeia and father of Andromeda.

Related forms

Ce·phe·id [see-fee-id] /ˈsi fi ɪd/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cepheid

British Dictionary definitions for cepheid (1 of 2)


/ (ˈsiːfjuːs) /

noun Latin genitive Cephei (ˈsiːfɪˌaɪ)

a faint constellation in the N hemisphere near Cassiopeia and the Pole StarSee also Cepheid variable

Word Origin for Cepheus

from Latin Cēpheus named after the mythical king

British Dictionary definitions for cepheid (2 of 2)


/ (ˈsiːfjuːs) /


Greek myth a king of Ethiopia, father of Andromeda and husband of Cassiopeia
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

Science definitions for cepheid (1 of 2)


[ sēfē-ĭd, sĕfē- ]

Any of a class of variable stars whose luminosity fluctuates with an extremely regular period. There is a strong correlation between the absolute magnitude of a Cepheid's luminosity and its period. By comparing the apparent magnitude of a Cepheid to the absolute magnitude corresponding to its period, it is possible to determine fairly accurately how distant the Cepheid is from Earth. Also called Cepheid variable

Science definitions for cepheid (2 of 2)


[ sēfyōōs′, -fē-əs ]

A constellation in the Northern Hemisphere near Cassiopeia and Draco.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.