latent heat

noun Physics.
heat absorbed or radiated during a change of phase at constant temperature and pressure.

1750–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
latent heat
(no longer in technical usage) the heat evolved or absorbed by unit mass (specific latent heat) or unit amount of substance (molar latent heat) when it changes phase without change of temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
latent heat   (lāt'nt)  Pronunciation Key 
The quantity of heat absorbed or released by a substance undergoing a change of state, such as ice changing to liquid water or liquid water changing to ice, at constant temperature and pressure. The latent heat absorbed by air when water vapor condenses is ultimately the source of the power of thunderstorms and hurricanes. See also heat capacity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

latent heat definition

The heat released or absorbed when matter undergoes a change of phase (see phases of matter). If the heat is given off during the change from a liquid to a solid, it is called heat of fusion. If it is given off during the change from a gas to a liquid, it is called heat of vaporization.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The latent heat used up for evaporation is given back during condensation and
  the energy consumed is quite small.
The remaining latent heat keeping the roads from freezing radiates into space.
Ocean evaporation estimates are calculated from satellite data that looks at
  latent heat fluxes.
The latent heat of melting will soak up a lot of energy that would otherwise
  have caused warming.
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