Etymology
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enthalpy (n.)

1927 in physics, from Greek enthalpein "to warm in," from en "in" (see en- (2)) + thalpein "to heat," from thalpos "warmth, heat," especially "summer heat."

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Definitions of enthalpy

enthalpy (n.)
(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure;
enthalpy is the amount of energy in a system capable of doing mechanical work
Synonyms: heat content / total heat / h
From wordnet.princeton.edu