1
- a signalling device by which sunlight is reflected in flashes from a movable mirror日光反射信号器。
1.1
- a message sent in such a way; a heliogram日光反射信号。
2
- a telescopic apparatus for photographing the sun（拍摄太阳用的）（套筒式）太阳照相仪。
3
- historical a type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish〈史〉日光胶版。
with obj.
1
- dated send (a message) by heliograph〈旧〉用日光反射信号器发送（信号）。
2
- historical take a heliographic photograph of〈旧〉用太阳照相仪拍摄。
派生词