Noun
pound-force (plural pounds-force)
A unit of force equal to a mass of one avoirdupois pound times a standard acceleration of gravity, equal to about 4.44822 newtons. Symbol lbf or lbf.
The pound-force has a metric counterpart, less commonly used than the newton: the kilogram-force (kgf) (sometimes kilopond), is the force exerted by standard gravity on one kilogram of mass. Source: Internet
See, for example: citation For example, abbreviating "pound-force-foot" to simply "pound-foot" (in this case, it would be implicit that the "pound" is pound-force and not pound-mass ). Source: Internet
The slug is another unit of mass derived from pound-force. Source: Internet
The slug is defined as the amount of mass that accelerates at 1 ft/s 2 when one pound-force is exerted on it, and is equivalent to about 32.2 pounds (mass). Source: Internet