[ kohld-bluhd-id ]
/ ˈkoʊldˈblʌd ɪd /


designating or pertaining to animals, as fishes and reptiles, whose blood temperature ranges from the freezing point upward, in accordance with the temperature of the surrounding medium; poikilothermic.
without emotion or feeling; dispassionate; cruel: a cold-blooded murder.
sensitive to cold.

Origin of cold-blooded

First recorded in 1585–95

Related forms

cold-blood·ed·ly, adverbcold-blood·ed·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cold-blooded

British Dictionary definitions for cold-blooded



having or showing a lack of feeling or pitya cold-blooded killing
informal particularly sensitive to cold
(of all animals except birds and mammals) having a body temperature that varies with that of the surroundingsTechnical term: poikilothermic

Derived Forms

cold-bloodedly, adverbcold-bloodedness, noun
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

Medicine definitions for cold-blooded



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for cold-blooded


[ kōldblŭdĭd ]

Having a body temperature that changes according to the temperature of the surroundings. Fish, amphibians, and reptiles are cold-blooded.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.