drag coefficient is a noun meaning "the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body". It carries one recorded sense.
the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
Definitions, synonyms and semantic relations for drag coefficient come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.