very small amounts. A pennyweight is a
measure of
weight equal to 1/20 of an ounce in
troy weight (a system of weights used for precious metals and gems, where there are twelve ounces to a
pound; as opposed to avoirdupois
weight, a British and
American system of weights based on a
pound of sixteen ounces).
—Self Analysis Glossary Final approval 12.3.90