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hadj
hadn’t
Hadramaut
Hadrian’s Wall
hadron
hadrosaur
hadst
haecceity
Haeckel’s law
haem
haema-, etc.
-haemia
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hafnium
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Haeckel’s law
Haeck·el's law


noun 
Definition:
 
theory of embryo development: the theory proposing as a law that an embryo in each stage of development resembles an organism that its species descended from
[After Ernst Haeckel]
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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