A pop filter.

That opportunity has already passed.

(physics) The portion of an isotope shift produced by the changing mass of a nucleus upon the addition of a neutron

(physics) The portion of an isotope shift produced by the changing shape of a nucleus upon the addition of a neutron

(nautical) A ship that is used to transport military personnel; a troopship.

A military (naval) vessel designed for operation on the marine surface, as distinguished from a submarine or other types of vessels. Aircraft carriers are also generally excluded.

(military, nautical) a sea-going military light ferry designed to assault shores that are held against them, and disembark forces directly onto the shore

The office or term of a governess.

Alternative spelling of phase-shift keying

Alternative spelling of frequency-shift keying