A perforated iron block with grooved sides, adapted for use in heading bolts and swaging large objects.

plural of blockfield

A surface covered by block-sized angular rocks, usually associated with alpine and subpolar climates and periglaciation.

(nautical) A fiddle block.

(nautical) A tackle block having two sheaves, one above the other.

(archaic) Yule log

(nautical) A block with a projection, or shoulder, near the upper end, so that it can rest against a spar without jamming the rope.

(nautical) A block at the extremity of a yard, through which the halyard of a studding sail is rove.

(rail transport) On railways, a system by which the track is divided into sections of three or four miles, and trains are run by the guidance of electric signals so that no train enters a section or block before the preceding train has left it.

(nautical) A block fixed in the topgallant or royal rigging, used for raising and lowering light masts and spars.