1. Having the back covered with spines

See also: backed

• urinary tract infection
• urinate
• urination
• urinator
• urine
• uriniferous tubule
• urinogenital
• URL
• Urmia
• urn
• urn fungus
• urn-shaped
• Urnula craterium
• urobilin
• urobilinogen
• urocele
• urochesia
• urochezia
• urochord
• Urochorda
• Urochordata
• urochordate
• Urocyon
• Urocyon cinereoargenteus
• Urocystis