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heat engine
heat exchanger
heat exhaustion
heat island
heat lightning
heat of combustion
heat of formation
heat of solution
heat prostration
heat pump
heat rash
heat-resistant
heat-seal
heat-seeking
heat shield
heat-shock protein
heat sink
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heartwood
heart·wood [ hrt wd ]


noun 
Definition:
 
central wood of tree: the wood at the center of a tree trunk or branch that is older, darker, and harder than the wood surrounding it
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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