The smallest part of a town enclosed by streets. / The distance from one urban street to the next, or an approximately comparable distance.

A pillow block

A large concrete block with a groove in the bottom face and a tongue on the top face to eliminate slippage when they are stacked. There is also a steel loop on the top face to facilitate lifting. The blocks are stacked in an offset manner to create a wall for retaining earth by means of their great mass. A wall built with them can be readily dismantled and the blocks reused (in ecological fashion).

a metal block for supporting a rotating shaft; a bearing

(idiomatic) A hindrance, obstacle or impediment; an opportunity for error.

The (usually temporary) inability to begin or continue work on a piece of writing, especially creative writing.

(Britain) A lightweight building block made from cinders and concrete.

A system in which a rope, cable, or chain (the tackle) is passed over pulleys enclosed in two (or rarely more) blocks, one fixed and one attached to a load, which is used to gain mechanical advantage to lift or pull heavy loads.

A lightweight building block made from cinders and concrete.

A lightweight building block made from cinders and concrete.