noun

1. : symbol for all preceding senses, oz
   1. a unit of weight, equal to pound avoirdupois or 16 drams (28.3495 grams)
   2. a unit of weight, equal to pound troy or 20 pennyweights (31.1035 grams)
   3. a unit of weight, equal to pound apothecaries' weight or 8 drams (31.1035 grams)
   4. fluid ounce
2. any small amount an ounce of care

Etymology: OFr unce < L uncia, a twelfth, twelfth part of a foot or pound, orig., unit, akin to L unus, one

noun

Etymology: ME once < OFr < l'once, mistaken for lonce < VL *luncea < L lynx, lynx