NAIL n.
A measure of length, being two inches and a quarter, or the sixteenth of a yard. Nail ball (Ordnance), a round projectile with an iron bolt protruding to prevent it from turning in the gun. -- Nail plate, iron in plates from which cut nails are made. -- On the nail, in hand; on the spot; immediately; without delay or…
OFFICER n.
fficer of the day (Mil.), the officer who, on a given day, has charge for that day of the quard, prisoners, and police of the post or camp. -- Officer of the deck, or Officer of the watch (Naut.), the officer temporarily in charge on the deck of a vessel, esp. a war vessel.