Cyclopean

[ sahy-kluh-pee-uh n, sahy-klop-ee-uh n ]
/ ˌsaɪ kləˈpi ən, saɪˈklɒp i ən /

adjective

of or characteristic of the Cyclops.
(sometimes lowercase) gigantic; vast.
(usually lowercase) Architecture, Building Trades. formed with or containing large, undressed stones fitted closely together without the use of mortar: a cyclopean wall.

Origin of Cyclopean

1635–45; < Latin Cyclōpē(us) (< Greek Kyklṓpeios, equivalent to Kýklōp(s) Cyclops + -eios -eous) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for cyclopean

Cyclopean

/ (ˌsaɪkləʊˈpiːən, saɪˈkləʊpɪən) /

adjective

of, relating to, or resembling the Cyclops
denoting, relating to, or having the kind of masonry used in preclassical Greek architecture, characterized by large dry undressed blocks of stone
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