cowslip
noun
cow·slip ˈkau̇-ˌslip 
1
: a common European primrose (Primula veris) with fragrant yellow flowers
2
: marsh marigold
Example Sentences
Recent Examples on the Web Police said Wednesday that the six arrested the previous day for violating forestry laws had collected more than 132 kilograms of primula veris, or cowslip, which can garner 100 euros per kilogram. 
Fox News, 26 Apr. 2018
Fox News, 26 Apr. 2018 Word History
Etymology
Middle English cowslyppe, from Old English cūslyppe, literally, cow dung, from cū cow + slypa, slyppe paste
First Known Use
before the 12th century, in the meaning defined at sense 1