1. A key commodity such as wool, leather, tin, lead, butter, or cheese (collectively termed the staple).
2. Hist. A town appointed by the Crown as an exclusive market for staple products. See STATUTE STAPLE.
3. Patents. An unpatented thing or material that is a component of a patented product or is used in a patented process, but also has other practical uses. • Patentees may not gain control of the market for staples through tying agreements. Cf. NONSTAPLE.