名詞 os:

1. a mouth or mouthlike opening
   同義詞：os
2. a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
   同義詞：osmium, Os, atomic number 76
3. (computer science) software that controls the execution of computer programs and may provide various services
   同義詞：operating system, OS
4. the left eye
   同義詞：oculus sinister, OS
5. rigid connective tissue that makes up the skeleton of vertebrates
   同義詞：bone, os

o.ra

n.（名詞）
Plural of os
os的復數