os os /ˈɑːs/

noun

1. () A mouth or mouthlike opening  ( os )
   a mouth or mouthlike opening
   
2. Rigid connective tissue that makes up the skeleton of vertebrates  ( os , bone )
   rigid connective tissue that makes up the skeleton of vertebrates
    The human body is made up of 206 bones
   The human body is made up of 206 bones
   
   

 OS

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

 Os

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

 Elisabethville Elisabethville /ˌɛlɪˈzæbɛθˌvɪl/

noun

1. A city in southeastern Congo near the border with Zambia; a copper mining center; former name (until 1966) was Elisabethville  ( Elisabethville , Lubumbashi )
   a city in southeastern Congo near the border with Zambia; a copper mining center; former name (until 1966) was Elisabethville
   
   

 Hudson River Hudson River /ˈhʌdsən ˈrɪvər/

noun

1. () A New York river; flows southward into New York Bay; explored by Henry Hudson early in the 17th century  ( Hudson River , Hudson )
   a New York river; flows southward into New York Bay; explored by Henry Hudson early in the 17th century
     The historic steamboat cruised along the Hudson River, transporting passengers in style.
   The historic steamboat cruised along the Hudson River, transporting passengers in style.
   
   

 belaying pin belaying pin /bɪˈleɪɪŋ pɪn/

noun

1. A wood or metal bar to which a rope can be secured (as on a ship or in mountain climbing)  ( belaying pin )
   a wood or metal bar to which a rope can be secured (as on a ship or in mountain climbing)
    Sailors use the belaying pin to secure the ropes on ships.
   Sailors use the belaying pin to secure the ropes on ships.