hypo

a prefix appearing in loanwords from Greek, where it meant “under” ( hypostasis ); on this model used, especially as opposed to hyper-, in the formation of compound words ( hypothyroid ).

Also, especially before a vowel, hyp-.

Origin:
< Greek, combining form of hypó under (preposition), below (adv.); cognate with Latin sub (see sub-); cf. up

Can be confused: hyper-, hypo-.

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To hypo

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World English Dictionary

hypo¹ (ˈhaɪpəʊ)

—n
	another name for sodium thiosulphate, esp when used as a fixer in photographic developing

[C19: shortened from hyposulphite]

hypo² (ˈhaɪpəʊ)

—n , pl -pos
	short for hypodermic syringe

hypo- or (before a vowel) hyp-

—*prefix*
1.	under, beneath, or below: hypodermic
2.	lower; at a lower point: hypogastrium
3.	less than: hypoploid
4.	(in medicine) denoting a deficiency or an abnormally low level: hypothyroid; hypoglycaemia
5.	incomplete or partial: hypoplasia
6.	indicating that a chemical compound contains an element in a lower oxidation state than usual: hypochlorous acid

[from Greek, from hupo under]

hyp- or (before a vowel) hyp-

—*prefix*

[from Greek, from hupo under]

Hypo-

—*prefix*
	indicating a plagal mode in music: Hypodorian

[from Greek: beneath (it lies a fourth below the corresponding authentic mode)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline

Word Origin & History

hypo-

Gk. hypo (prep. and adv.) "under" (see sub-).

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

hypo hy·po (hī'pō)
n.

A hypodermic syringe.
A hypodermic injection.

hypo- or hyp-
pref.

Below; beneath; under: hypochondriac.
Less than normal; deficient: hypofunction.
In the lowest state of oxidation: hypoxanthine.

American Heritage

Science Dictionary

hypo- or hyp-
A prefix that means "beneath" or "below," as in hypodermic, below the skin. It also means "less than normal," especially in medical terms like hypoglycemia. In the names of chemical compounds, it means "at the lowest state of oxidation," as in sodium hypochlorite.

American Heritage

Abbreviations & Acronyms

hypo