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-in

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-in¹

suffix -ins

  1. countable, morpheme, uncountable A neutral chemical compound. albumin, casein, chitin, pepsin, saponin
  2. countable, morpheme, uncountable An enzyme. renin, pancreatin
  3. countable, morpheme, uncountable An antibiotic. penicillin, streptomycin
  4. countable, morpheme, uncountable A pharmaceutical product. cobalamin, niacin, vitamin

-in²

Where it comes from

From the particle in, modelled after sit-in. Compare -off.

suffix -ins

  1. morpheme Attached to a word (usually a verb) to denote a protest, demonstration or other type of gathering characterized by the activity denoted by the base word. At Stanford 380 students volunteered to give blood for military and civilian casualties in South Viet Nam: Ohio State held a similar “bleed-in.”

-in³

Where it comes from

Emically usually held to be a clipping of -ing. Etically a prosodically coexistent alternative form thereof in some varieties.

suffix -in’

  1. alternative, dialectal, informal, morpheme Alternative form of -ing

-in⁴

suffix

  1. alternative, morpheme Alternative form of -en elf + -in → elfin

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Cite this
MLA

"-in." Wiktionary, via Micwyn, micwyn.com/word/-in. Accessed 6 Nov. 2026.

APA

-in. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/-in

Chicago

"-in." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/-in.

BibTeX
@misc{in_2026,
  title = {-in},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/-in},
  urldate = {2026-11-06}
}