1. heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature; - Example: "the heat of fusion is equal to the heat of solidification"
WordNet (r) 3.0 (2006):
heat of fusion
n 1: heat absorbed by a unit mass of a solid at its melting
point in order to convert the solid into a liquid at the
same temperature; "the heat of fusion is equal to the heat
of solidification"