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hypersonic
hyperspace
hypersthene
hypersurface
hypertension
hypertensive retinopathy
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hyperthermia
hyperthyroidism
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hypertrophy
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hyperventilation syndrome
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hypnagogic image
hyp·na·gog·ic im·age (plural hyp·na·gog·ic im·ag·es)


noun 
Definition:
 
something seen before sleep: something of the nature of a hallucination seen or imagined by somebody just before falling asleep
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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