(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

Alternative spelling of chockablock

Alternative spelling of chockablock

(programming) A block of source code, often one that is delimited by brackets or in some similar way, depending on the programming language.

Alternative form of woodblock

plural of beta blocker

(pharmacology) A class of drug used to treat hypertension and also angina and arrhythmia.

plural of calcium channel blocker