Vocabulary : Block book to Blockage

Block book : A book printed from engraved wooden blocks instead of movable types.
Block chain : A chain in which the alternate links are broad blocks connected by thin side links pivoted to the ends of the blocks, used with sprocket wheels to transmit power, as in a bicycle.
Block signal : One of the danger signals or safety signals which guide the movement of trains in a block system. The signal is often so coupled with a switch that act of opening or closing the switch operates the signal also.
Block system : A system by which the track is divided into short sections, as of three or four miles, and trains are so run by the guidance of electric, or combined electric and pneumatic, signals that no train enters a section or block until the preceding train has left it, as in absolute blocking, or that a train may be allowed to follow another into a block as long as it proceeds with excessive caution, as in permissive blocking.
Block tin : See under Tin.

Blockade : The shutting up of a place by troops or ships, with the purpose of preventing ingress or egress, or the reception of supplies; as, the blockade of the ports of an enemy. ;; An obstruction to passage. ;; To shut up, as a town or fortress, by investing it with troops or vessels or war for the purpose of preventing ingress or egress, or the introduction of supplies. See note under Blockade, n. ;; Hence, to shut in so as to prevent egress. ;; To obstruct entrance to or egress from.
Blockaded : of Blockade
Blockader : One who blockades. ;; A vessel employed in blockading.
Blockading : of Blockade
Blockage : The act of blocking up; the state of being blocked up.

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