etymology - Why is "pound" (of weight) abbreviated "lb"?


Answers to Correct usage of lbs. as in "pounds" of weight suggest that "lb" is for "libra" (Latin), but how has this apparent inconsistency between the specific unit of weight "pound" and the more general concept of weight "libra" arisen? It seems analogous to abbreviating "grams" to "w" for weight which makes no sense to me.


Update: very nice historical context provided in your answers. Interesting that the Latin term has evolved into both pound (weight) in English and liter (volume) through Greek. I wonder if this is related to how "ounce" can refer to both weight and volume (fluid ounce)?




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