different between protrusion vs outjet

English

From French protrusion

protrusion (countable and uncountable, plural protrusions)

(uncountable) The act of protruding.
(Can we add an example for this sense?)
(uncountable) The state of being protruded.
(Can we add an example for this sense?)
(countable) Anything that protrudes.
Synonym: protuberance

out- +? jet

outjet (plural outjets)

(archaic) That which jets out or projects; a protrusion.
- 1854, Hugh Miller, My Schools and Schoolmasters
  I shook them in a manner that must have exerted no small leverage power on the outjet beneath

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