1. Resembling an enzyme

See also: enzyme

• Isthmus of Corinth
• Isthmus of Darien
• Isthmus of Kra
• Isthmus of Panama
• Isthmus of Suez
• Isthmus of Tehuantepec
• Istiophoridae
• Istiophorus
• Istiophorus albicans
• Isuprel
• Isuridae
• Isurus
• Isurus glaucus
• Isurus oxyrhincus
• Isurus paucus
• Isère
• Isère River
• it
• it never rains but it pours
• it'd
• it'll
• itaconic acid
• Italia
• Italian
• Italian bee