WordReference Random House Learner's Dictionary of American English © 2026
but•tress /ˈbʌtrɪs/USA pronunciation   n. 
    [countable]
  1. Building, Architecturea support that sticks out from the wall of a building to keep it steady:the buttresses of the old cathedrals in England.
  2. any prop or support:the buttresses of civilized society.

v. [+ object]
  1. Architectureto support by means of a buttress;
    prop up:The builders buttressed this wall with stone structures that are marvels of engineering.
  2. to give support or encouragement to:Try to buttress the points you make in these chapters with some details.

WordReference Random House Unabridged Dictionary of American English © 2026
but•tress  (butris),USA pronunciation n. 
  1. Building, Architectureany external prop or support built to steady a structure by opposing its outward thrusts, esp. a projecting support built into or against the outside of a masonry wall.
  2. any prop or support.
  3. a thing shaped like a buttress, as a tree trunk with a widening base.
  4. Zoologya bony or horny protuberance, esp. on a horse's hoof.

v.t. 
  1. Architectureto support by a buttress;
    prop up.
  2. to give encouragement or support to (a person, plan, etc.).
  • Gmc; see butt3) + -et -et
  • Middle English butres Old French (arc) boterez thrusting (arch) nominative singular of boteret (accusative), equivalent. to boter- abutment (perh. 1350–1400
buttress•less, adj. 
buttress•like′, adj. 
    6. encourage, hearten, support, inspirit, brace, back up, reinforce, shore up.

Collins Concise English Dictionary © HarperCollins Publishers::
buttress /ˈbʌtrɪs/ n
  1. Also called: pier a construction, usually of brick or stone, built to support a wall
    See also flying buttress
  2. any support or prop
  3. something shaped like a buttress, such as a projection from a mountainside
vb (transitive)
  1. to support (a wall) with a buttress
  2. to support or sustain
Etymology: 13th Century: from Old French bouterez, short for ars bouterez thrusting arch, from bouter to thrust, butt3

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