2. A wooden or metal bar or pin, used to support or steady
anything.
3. A pin of hard wood, tapering to a point, used to open the
strands of a rope in splicing.
Note: There are hand fids and standing fids (which are larger
than the others, and stand upon a flat base). An iron
implement for this purpose is called a marline spike.
4. (Mil.) A block of wood used in mounting and dismounting
heavy guns.