in situ

adverb or adjective in si·tu \ (ˌ)in-ˈsī-(ˌ)tü , -ˈsi- , -(ˌ)tyü also -ˈsē- , -(ˌ)chü \
Updated on: 17 Apr 2018

Definition of in situ

: in the natural or original position or place
  • an in situ cancer confined to the breast duct

Recent Examples of in situ from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'in situ.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of in situ

Latin, in position

Medical Dictionary

in situ

adverb or adjective in si·tu \ (ˈ)in-ˈsī-(ˌ)t(y)ü, -ˈsi- also -ˈsē-, -(ˌ)chü \

medical Definition of in situ

: in the natural or original position or place
  • an in situ cancer confined to the breast duct
— see carcinoma in situ

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