1. Involving four parties
   - quadripartite

See also: many-sided, multilateral

• red-shafted flicker
• red-shouldered hawk
• red-skinned onion
• red-spotted purple
• red-streaked
• red-striped
• red-tailed hawk
• red-tapism
• red-veined pie plant
• red-violet
• red-winged blackbird
• redact
• redaction
• redactor
• redan
• redback vole
• redbelly
• redberry
• redbird
• redbird cactus
• redbird flower
• redbone
• redbreast
• redbrick
• redbrick university