Fid

[From Lat. findere, fid i, to divide.] ( Naut.) A large, pointed pin, with an eye at the thick end, of iron or lignum vitæ, used in separating and interlacing the strands of which the splicing-rope is composed. - A mast - fid is a bolt inserted through the bottom of a ship's topmast or top-gallant-mast, with ends resting on the trestle-trees sustained by the head of the lower mast or topmast. Unle the mast-fid be withdrawn, the supported mast cannot be lowered.