Rahu Definition

(Hinduism) A snake that swallows the sun or the moon causing eclipses. He is depicted in art as a dragon with no body riding a chariot drawn by eight black horses. Rahu is also one of the navagrahas (nine planets) in Vedic astrology.

(Buddhism) A supernatural being the Tibetan Buddhist tradition, particularly the Nyingma lineage. Usually depicted as dark blue in colour and having nine heads one of which is that of a raven. He has a face in his belly the mouth of which swallows up the moon or sun during eclipses. He is master of the nine planets and the god of solar and lunar eclipses.