protrusion
noun
pro·tru·sion
prō-ˈtrü-zhən 
1
: something (such as an anatomical part or excrescence) that protrudes
2
: the act of protruding : the state of being protruded
Examples of protrusion in a Sentence
bony protrusions on the outside of the elbow
a roof with many protrusions
The pain was caused by a protrusion of a disc in his lower back.
Recent Examples on the Web
The female’s back is covered in small protrusions that resemble popped kernels of popcorn, inspiring its genus name Zea, derived from the corn plant.
—
Aamir Khollam, Interesting Engineering, 16 Oct. 2025
This protein is needed for the formation of cilia — hairlike protrusions that cells can use to move — as well as in the assembly of the mitotic spindle that organizes chromosomes during cell division, and for the transport of neurotransmitters in neurons.
—Quanta Magazine, 8 Oct. 2025
Karst formations, a porous rock, stick out as jagged protrusions in between lush forest and provide plenty of places for small creatures to hide.
—Irene Wright, Miami Herald, 2 Oct. 2025
Their name comes from the unique protrusions on their back that resemble horns and serve as a defense mechanism against predators including other sharks, elephant seals and some large fish.
—Ashley MacKin Solomon, San Diego Union-Tribune, 7 Sep. 2025
See All Example Sentences for protrusion
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Aamir Khollam, Interesting Engineering, 16 Oct. 2025
This protein is needed for the formation of cilia — hairlike protrusions that cells can use to move — as well as in the assembly of the mitotic spindle that organizes chromosomes during cell division, and for the transport of neurotransmitters in neurons.
—Quanta Magazine, 8 Oct. 2025
Karst formations, a porous rock, stick out as jagged protrusions in between lush forest and provide plenty of places for small creatures to hide.
—Irene Wright, Miami Herald, 2 Oct. 2025
Their name comes from the unique protrusions on their back that resemble horns and serve as a defense mechanism against predators including other sharks, elephant seals and some large fish.
—Ashley MacKin Solomon, San Diego Union-Tribune, 7 Sep. 2025
See All Example Sentences for protrusion
Cite this Entry
“Protrusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protrusion. Accessed 31 Oct. 2025.
Copy CitationKids Definition
protrusion
noun
pro·tru·sion
prō-ˈtrü-zhən
1
: the act of protruding : the state of being protruded
2
: something that protrudes
Medical Definition
protrusion
noun
pro·tru·sion
prō-ˈtrü-zhən
1
: the quality or state of protruding
the protrusion of a jaw
2
: something (as an anatomical part) that protrudes
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