1. Evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils
   - scouring rush, rough horsetail, Equisetum hyemale, Equisetum hyemale robustum

Type of: horsetail

• ochrea
• ochreous
• Ochroma
• Ochroma lagopus
• ochronosis
• Ochs
• Ocimum
• Ocimum basilicum
• ocker
• Ockham
• Ockham's Razor
• oconee bells
• ocotillo
• OCR
• oct-
• octa-
• octad
• octadecanoic acid
• octagon
• octagonal
• octahedral
• octahedron
• octal
• octal digit
• octal notation