wall

1. A rampart of earth, stones etc. built up for defensive purposes.
2. A structure built for defense surrounding a city, castle etc.

   The town wall was surrounded by a moat.

3. Each of the substantial structures acting either as the exterior of or divisions within a structure.

   We're adding another wall in this room during the remodeling.  The wind blew against the walls of the tent.

4. A point of desperation.
5. A point of defeat or extinction.
6. An impediment to free movement.

   A wall of police officers met the protesters before they reached the capitol steps.

7. A type of butterfly (Lasiommata megera).
8. (often in combination) A barrier.

   a seawall;  a firewall

9. A barrier to vision.
10. Something with the apparent solidity and dimensions of a building wall.

    a wall of sound;  a wall of water

11. A divisive or containing structure in an organ or cavity.
12. (auction) A fictional bidder used to increase the price at an auction.
13. A doctor who tries to admit as few patients as possible.
14. A line of defenders set up between an opposing free-kick taker and the goal.
15. A personal notice board listing messages of interest to a particular user.

1. To enclose with, or as if with, a wall or walls.

   He walled the study with books.

1. To boil.
2. To well, as water; spring.

noun

A spring of water.

noun

A kind of knot often used at the end of a rope; a wall knot or wale.

verb

To make a wall knot on the end of (a rope).

1. Used to acknowledge a statement or situation.

   “I didn't like the music.” “Well, I thought it was good.”

2. An exclamation of surprise (often doubled or tripled).

   Well, well, well, what do we have here?

3. An exclamation of indignance.

   Well! There was no need to say that in front of my mother!

4. Used in speech to express the overcoming of reluctance to say something.

   It was a bit... well... too loud.

5. Used in speech to fill gaps, particularly at the beginning of a response to a question; filled pause.

   “So what have you been doing?” “Well, we went for a picnic, and then it started raining so we came home early.”

6. (Hiberno-English) Used as a greeting

   Well lads. How's things?