a unit of weight equal to 437.5 grains or 1 / 16 pound (28.349 grams) avoirdupois.

a unit of 480 grains, 1 / 12 pound (31.103 grams) troy or apothecaries' weight.

a fluid ounce.

a small quantity or portion.

noun

of weight avoirdupois , troy , uncia , crumb , dab , dash , dot , dram , drop , fragment , grain , iota , jot , minim , mite , modicum , molecule , ort , particle , scrap , scruple , shred , smidgen , speck , tittle , trifle , whit , hoot