Entry 1 sense Webster, 1913 Sunroof /sŭn'-ro͞ofˌ/ · Sun·roof · IPA /ˈsʌnˌɹuːf/ 01 n. a panel in the roof of an automobile, usually above the driver's seat, that can be opened. 1. a panel in the roof of an automobile, usually above the driver's seat, that can be opened.