Transliteration: ku mud
<noun> "Kumud". This name is believed to be a corruption of the Sanskrit ཀུནྡ་ Kunda. It is said in Buddhist scriptures to be a white flower that grows in or near water and blossoms at night, and induces extreme hallucinations if eatent. This fits exactly with the Datura plant—which it is generally regarded to be. It is a member of the Lily family, grows close to streams, has a very large, white, trumpet-like flower that opens into a wide blossom at night, especially in the moon-light, because of which it is also known as the "moon lily". It is exceptionally hallucinogenic and kills in small doses.The name is also freq. spelled ཀུ་མུ་ད་. [GCD] gives ཨུཏྤལ་དཀར་པོའི་མིང་ i.e., "another name for the white ཨུཏྤལ་ Utpala lotus (flower)" but this would be a mistake made by Tibetan authors who do not know the Datura plant.
This flower is very white, so is also used as an example of being very white.