Pumps' Perplexities

Yes, lbs....Recently I was asked what lbs ment....
Like in 140 lbs .... We all know that it means
pounds.... So the real question is why is it not
pds for pounds since oz means ounce or ounces?...

Well, for all that are interested, lbs or rather lb
is an abbreviation for the Latin word libra ...
Their word for pound...Therefore 140 lbs=cxl lb...

And just so that no one gets further confused,
library comes from the Latin liber or libarius ...
A different Latin word....Pumps