The Collaborative International Dictionary of English v.0.48:
Sunroof \Sun"roof`\, n. a panel in the roof of an automobile, usually above the driver's seat, that can be opened. [PJC] SunsetWordNet (r) 3.0 (2006):
sunroof n 1: an automobile roof having a sliding or raisable panel; "`sunshine-roof' is a British term for `sunroof'" [syn: sunroof, sunshine-roof]