The Collaborative International Dictionary of English v.0.48:
Porter \Por"ter\, n. [F. porteur, fr. porter to carry, L.
portare. See Port to carry.]
1. A carrier; one who carries or conveys burdens, luggage,
etc.; for hire.
2. (Forging) A bar of iron or steel at the end of which a
forging is made; esp., a long, large bar, to the end of
which a heavy forging is attached, and by means of which
the forging is lifted and handled in hammering and
heating; -- called also porter bar.
3. A malt liquor, of a dark color and moderately bitter
taste, possessing tonic and intoxicating qualities.
Note: Porter is said to be so called as having been first
used chiefly by the London porters, and this
application of the word is supposed to be not older