Webster's English Dictionary

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ruby

1. ru.by \'ru:-be-\ n [ME, fr. MF rubis, rubi, irreg. fr. L rubeus reddish; 
   akin to] L ruber red - more at RED 1a: a precious stone that is a red 
   corundum  1b: something made of ruby; esp : a watch bearing or other part 
   of  ruby or a substitute material 2a: the dark red color of the ruby  2b: 
   something resembling a ruby in color  3: a Brazilian hummingbird (genus 
   Clytolaema) whose male has a ruby t hroat or breast
2. ruby aj : of the color ruby