1. Written in the form of or carried on by letters or correspondence
   "the epistolatory novel"
   - epistolary

See also: informal

• quadripara
• quadripartite
• quadriphonic
• quadriphonic system
• quadriplegia
• quadriplegic
• quadrisonic
• quadrivalent
• quadrivial
• quadrivium
• quadroon
• quadrumanous
• quadrumvirate
• quadruped
• quadrupedal
• quadruple
• quadruple time
• quadruplet
• quadruplex
• quadruplicate
• quadruplication
• quadrupling
• quadruply
• quadtree
• quaestor