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1. A mouth or mouthlike opening

1. Rigid connective tissue that makes up the skeleton of vertebrates
   - bone

1. (computing) software that controls the execution of computer programs and may provide various services
   - operating system
    
2. The left eye
   - oculus sinister

1. A hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
   - osmium, atomic number 76

1. The 15th letter of the Roman alphabet
   - O

Derived forms: ora, ossa

Type of: alphabetic character, computer software, connective tissue, eye, letter, letter of the alphabet, metal, metallic element, oculus, opening, optic, orifice, package, porta, software, software package, software program, software system

Part of: endoskeleton, horn, Latin alphabet, platform, Roman alphabet

Encyclopedia: Os, Ton van