Definition of wall
(Entry 1 of 3)
1a
: a high thick masonry structure forming a long rampart or an enclosure chiefly for defense
—often used in plural
b
: a masonry fence around a garden, park, or estate
c
: a structure that serves to hold back pressure (as of water or sliding earth)
2
: one of the sides of a room or building connecting floor and ceiling or foundation and roof
3
: the side of a footpath next to buildings
4
: an extreme or desperate position or a state of defeat, failure, or ruin
the surrounded troops had their backs against the wall
5
: a material layer enclosing space
the wall of a container heart walls
6
: something resembling a wall (as in appearance, function, or effect)
especially
: something that acts as a barrier or defense
a wall of reserve tariff wall
off the wall
up the wall
slang
: crazy
the plan was off the wall
slang
: into a state of intense agitation, annoyance, or frustration
the noise drove me up the wall
wall
verb (1)
walled; walling; walls
Definition of wall (Entry 2 of 3)
1a
: to provide, cover with, or surround with or as if with a wall
wall in the garden
b
: to separate by or as if by a wall
walled off half the house
2a
: immure
walled the monster up within the tomb— E. A. Poe
b
: to close (an opening) with or as if with a wall
wall
verb (2)
walled; walling; walls
Definition of wall (Entry 3 of 3)
of the eyes
: to roll in a dramatic manner
: to roll (one's eyes) in a dramatic manner
Buying Guide
Redecorate with peel and stick wallpaper selected by our Reviews team.
Test Your Vocabulary
Great Words for Scrabble
-
- Which of the following Q-without-U words means the number five in cards or dice?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share wall
Time Traveler for wall
The first known use of wall was before the 12th century
See more words from the same century