Illustration of buttress
- buttress 1
1
architecture
: a projecting structure of masonry or wood for supporting or giving stability to a wall or building
2
: something that resembles a buttress: such as
a
: a projecting part of a mountain or hill
b
biology
: a horny protuberance on a horse's hoof at the heel see hoof illustration
c
botany
: the broadened base of a tree trunk or a thickened vertical part of it
3
: something that supports or strengthens
a buttress of the cause of peace
buttressed; buttressing; buttresses
architecture
: to give support or stability to (a wall or building) with a projecting structure of masonry or wood : to furnish or shore up with a buttress (see buttress entry 1 sense 1)
Did you know?
The word buttress first budded in the world of architecture during the 14th century, when it was used to describe an exterior support that projects from a wall to resist the sideways force, called thrust, created by the load on an arch or roof. The word ultimately comes from the Anglo-French verb buter, meaning "to thrust." Buter is also the source of our verb butt, meaning "to thrust, push, or strike with the head or horns." Buttress developed figurative use relatively soon after its adoption, being applied to anything that supports or strengthens something else. No buts about it: the world would not be the same without buttresses.
Examples of buttress in a Sentence
Noun
the mother had always been the buttress of our family in trying times
after the wall collapsed, the construction company agreed to rebuild it with a buttress
Verb
The treaty will buttress the cause of peace.
The theory has been buttressed by the results of the experiment.
Recent Examples on the Web
Adam Williams
april 21, New Atlas, 21 Apr. 2026
Arches and natural bridges sweep like buttresses from jumbles of rock, giving this landscape a mystical, cathedral-like quality.
—Madison Chapman, Outside, 25 Mar. 2026
Dennis Lin, New York Times, 27 Apr. 2026
Gukesh’s calm at the board was buttressed by an unusual focus in his training, on psychology, alongside the more traditional tactical and strategic instruction.
—Louisa Thomas, New Yorker, 26 Apr. 2026
See All Example Sentences for buttress
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Noun
Three setbacks provide space for landscaped terraces, and at these floors, the structural columns slope inward, becoming tall buttresses that reintegrate into the latticework.
—Adam Williams
april 21, New Atlas, 21 Apr. 2026
Arches and natural bridges sweep like buttresses from jumbles of rock, giving this landscape a mystical, cathedral-like quality.
—Madison Chapman, Outside, 25 Mar. 2026
Verb
Veteran starter Lucas Giolito joined the organization last week, buttressing a shallow rotation.
—Dennis Lin, New York Times, 27 Apr. 2026
Gukesh’s calm at the board was buttressed by an unusual focus in his training, on psychology, alongside the more traditional tactical and strategic instruction.
—Louisa Thomas, New Yorker, 26 Apr. 2026
See All Example Sentences for buttress
Cite this Entry
“Buttress.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/buttress. Accessed 1 May. 2026.
Copy CitationKids Definition
buttress
1 of 2 noun
but·tress
ˈbə-trəs 
1
: a structure built against a wall or building to give support and strength
2
: something that supports, props, or strengthens
buttress
2 of 2 verb
: to support with or as if with a buttress
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