Blockheadism :: Blockheadism (n.) That which characterizes a blockhead; stupidity.
Blockhouse :: Blockhouse (n.) An edifice or structure of heavy timbers or logs for military defense, having its sides loopholed for musketry, and often an upper story projecting over the lower, or so placed upon it as to have its sides make an angle wit the sides of the lower story, thus enabling the defenders to fire downward, and in all directions; -- formerly much used in America and Germany..
Breechblock :: Breechblock (n.) The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge. It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired..
Chockablock :: Chockablock (a.) Hoisted as high as the tackle will admit; brought close together, as the two blocks of a tackle in hoisting..
Tailblock :: Tailblock (n.) A block with a tail. See Tail, 9..
Top-block :: Top-block (n.) A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, -- used in swaying and lowering the topmast..