Definition of "hypo" in English

noun

1. (obsolete) Melancholy; a fit of hypochondria; a morbid depression.

   • 1711 "I have a better Stomach tha usuall and have perfectly forgot what the Hyppo means",Joseph Collett, merchant, writing from Rio de Janeiro, Oct 15, 1711, in his Private Letter Books, edited by H. H. Dodwell in 1933. (cited by Eric Partidge, A Dictionary of Slang and Unconventinoal English
   • 1837 Abraham Lincoln: Tell your sister I dont want to hear any more about selling out and moving. That gives me the hypo whenever I think of it. (Letter to Mary S. Owens, May 7. 1837, Collected Works of Abraham Lincoln. Volume 1.

2. (slang) A hypochondriac.

3. (photography, informal) Sodium thiosulfate (also called hyposulfite of soda), a photographic fixing agent.

4. (slang) A hypoglycaemia attack in a person with diabetes.

5. (slang) A hypodermic syringe or injection.

6. (slang, finance, British) Hypothecation.

7. (informal, law) A hypothetical case.

8. (informal, zoology) A hypomelanistic snake.

verb

1. (intransitive, slang) To have a hypoglycaemia attack.

2. (transitive) To administer a hypodermic injection to.

3. (transitive, figuratively) To stimulate or boost, as if by administering a hypodermic injection. (Compare hype.)

4. (transitive, economics) To stimulate or boost (the economy) by the injection of cash, such as with quantitative easing