Meaning of heat of fusion

heat' of fu'sion

Pronunciation: [key]
— Physics. Physics.
  1. the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification. Cf. latent heat.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.