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rubidium
rubidium-strontium dating
Rubik’s cube
ruble
RuBP
rubric
rubricate
rubrician
ruby
ruby port
ruby spinel
ruby-throated hummingbird
ruby wedding
RUC
ruche
ruching
ruck (1)
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ruby

ru·by [ rbee ] (plural ru·bies)


noun 
Definition:
 
1. red gemstone: a red precious stone that is a form of corundum. Use: jewelry, manufacture of watches, precision instruments.

2. deep red: a deep glowing purplish red color like that of a ruby

[14th century. Via Old French rubi< medieval Latin rubinus< Latin rubeus "red"]

ru·by adjective
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