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blockade the barring or shutting off of traffic in and out of an area, such as a seaport or city, by hostile military forces. [3 definitions]
blockage the act of blocking, or the condition of being blocked. [2 definitions]
block and tackle a rigging of pulley blocks and rope or cables used to provide leverage for hauling or lifting heavy loads.
blockbuster a person or thing of great force and overwhelming power. [2 definitions]
blockbusting having overwhelming force or effectiveness. [3 definitions]
blocker in football, an offensive player who tries to block defensive players from tackling the ball carrier. [2 definitions]
blockhead a stupid or dull person; oaf.
blockhouse a fortified building with openings for cannons and rifles to fire through, formerly built of heavy wooden timbers. [3 definitions]
blockish like a block of wood in sensitivity or awareness; dull or stupid.
block letter a simple, hand-printed capital letter. [2 definitions]
blocky like a block in bulk; chunky. [2 definitions]
Bloemfontein the judicial capital of South Africa. (Cf. Cape Town, Pretoria.)
blog shortened from "Web log," an online journal that may be personal or topical, in which the author makes regular entries that appear in reverse chronological order and can be read by the general public. [2 definitions]
bloke (chiefly British; informal) a male person; man; guy.
blond having light-colored hair and usu. also a fair complexion. [3 definitions]
blonde of a girl or woman, having light-colored hair. [2 definitions]
blood the red fluid containing oxygen and nutrients that circulates in the vascular system of vertebrates. [7 definitions]
blood bank a place where blood is collected, processed, and stored as whole blood or plasma, for later use in transfusion.
bloodbath a brutal and indiscriminate slaughter of many people or a whole population; massacre. [2 definitions]
blood blister a blister that contains blood and sometimes also serum. (Cf. water blister.)
blood brother one's brother by birth. [2 definitions]