1. Characterized by the interdependence of living organisms in an environment
   - ecological 
2. Of or relating to the science of ecology
   - ecological, bionomical, bionomic

See also: ecology

• uremia
• uremic
• ureter
• ureteritis
• ureterocele
• ureterorenal reflux
• ureterostenosis
• urethane
• urethra
• urethral
• urethral orifice
• urethral sphincter
• granulocytopenia
• granuloma
• granuloma inguinale
• granuloma venereum
• granulomatous
• granulose
• Granville Stanley Hall
• granville wilt
• Granville-Barker
• grape
• grape arbor
• grape arbour
• grape fern