Units of measure, that is. Remember kids, “The metric system is the tool of the devil! My car gets forty rods to the hogshead and that’s the way I likes it.“
1. An ancient Roman, and old medical, fluid measure; a saucerful; usually reckoned at 2 ½ fluid ounces, or one-eighth of a pint.
2. = ACETABULUM 2b. [This is Bob. Since you can’t follow that word as a link, I’ll quote that sense of the word here too. “b. The socket of the thigh-bone.”]