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

• tool steel
• tool-and-die work
• toolbar
• toolbox
• tooler
• toolhouse
• toolmaker
• toolshed
• toom
• toon
• Toona
• Toona calantas
• toonie
• tooshie
• toot
• tooter
• tooth
• tooth and nail
• tooth decay
• tooth doctor
• tooth enamel
• tooth fairy
• tooth fungus
• tooth root
• tooth shell