subluminal
/ˌsʌbˈl(j)uːmɪnl/Physics
adjective
Less rapid than the speed of light.
Origin
1960s. From sub- + luminal.
- cosmogenic
- cosmogeny
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- cosmogonist
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- cosmological argument
- cosmological constant
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- cosmopolitan
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- cosmopolitanize
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- COSPAR