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“subluminal”
subluminal (adjective), more subluminal, most subluminal
Characteristic of having a speed slower than that of light: It was obvious that the thunderings in the storm had subluminal sounds that were traveling slower than the speeds of the bursts of lightenings because Sally and her friend saw the flashes long before they heard the rumblings!
This entry is located in the following units:
lumen-, lumin-, lum-
(page 5)
sub-, suc-, suf-, sug-, sum-, sup-, sur-, sus-, su-
(page 4)