distributor cap is a noun meaning "the cap of the distributor that holds in place the wires from the distributor to the spark plugs". It carries one recorded sense.
the cap of the distributor that holds in place the wires from the distributor to the spark plugs
Definitions, synonyms and semantic relations for distributor cap come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.