hypo

1 [hahy-poh] Informal.
noun, plural hypos.
1.
a hypodermic syringe or injection.
2.
a stimulus or boost.
verb (used with object)
3.
to administer a hypodermic injection to.
4.
to stimulate by or as if by administering a hypodermic injection.
5.
to increase, boost, or augment: to hypo the car's power by installing a bigger engine.

Origin:
by shortening of hypodermic; sense “stimulate” perhaps by association with hype1; see -o

Dictionary.com Unabridged

hypo

2 [hahy-poh]

Origin:
1860–65; shortening of hyposulfite

hypo

3 [hahy-poh]
noun Archaic.

Origin:
by shortening

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

hyper-, hypo-.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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.

  1. A hypodermic syringe.

  2. A hypodermic injection.

hypo- or hyp-
pref.

  1. Below; beneath; under: hypochondriac.

  2. Less than normal; deficient: hypofunction.

  3. In the lowest state of oxidation: hypoxanthine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
hypo
  1. hypodermic [injection]

  2. sodium hyposulfite

  3. sodium thiosulfate

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Finally, dyskinetic cerebral palsy is characterised by both hypo- and
  hypertonia often alternating in the same muscles.
Not only is this food not molecular or hyper-manipulated-it's hypo-manipulated.
There are a number of breeds that are hypo-allergenic.
Humidifiers and hypo-allergenic pillows are also available if requested.
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