[ ih-rid-n-uh s ]
/ ɪˈrɪd n əs /

noun, genitive E·rid·a·ni [ih-rid-n-ahy] /ɪˈrɪd nˌaɪ/. Astronomy.

the River, a large southern constellation between Cetus and Orion, containing the bright star Achernar. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for eridanus

/ (ɛˈrɪdənəs) /

noun Latin genitive Eridani (ɛˈrɪdəˌnaɪ)

a long twisting constellation in the S hemisphere extending from Orion to Hydrus and containing the first magnitude star Achernar

Word Origin for Eridanus

from Greek Eridanos river in Italy (sometimes identified with the Po) into which, according to legend, Phaëthon fell
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