radiator cap

1. 1.

   cap on the opening in the top of a radiator through which a coolant liquid can be added

   Broadercap

   Part ofradiator

Questions about radiator cap

What does radiator cap mean?

radiator cap means "cap on the opening in the top of a radiator through which a coolant liquid can be added".

Is radiator cap a common word?

radiator cap is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.