'Pennyweight' definitions:

Definition of 'pennyweight'

(from WordNet)
noun
A unit of apothecary weight equal to 24 grains

Definition of 'Pennyweight'

From: GCIDE
  • Pennyweight \Pen"ny*weight`\, n. A troy weight containing twenty-four grains, or the twentieth part of a troy ounce; 1.555 grams; as, a pennyweight of gold or of arsenic. It is abbreviated dwt or pwt. It was anciently the weight of a silver penny, whence the name. [1913 Webster + PJC]