(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.

a copolymer that is a block polymer - adjacent blocks being multiples of different monomers

(chemistry) A polymer which is a block macromolecule.

(chemistry) any macromolecule composed of a linear sequence of blocks

(computing) A dedicated block usually at the beginning (first block on first track) of a storage medium that holds special data used to start a system. Some systems use a boot block of several physical sectors, while some use only one boot sector. Other manufacturers use the terms boot block and boot sector interchangeably.

(nautical) A block having a rope about it, and on an end hanging several feet from it.

(nautical) a thick, strong single block