강아지풀

Etymology
The underlying form was almost certainly. The Middle Korean term meant weeds in general, not foxtail millets specifically.

The suffix was applied to the Middle Korean form in the seventeenth century, ultimately producing the form  by the eighteenth century. This form differed from the word by only one consonant, and the foxtail strongly resembles an animal's furred tail (hence also the English name). Nineteenth-century speakers hypercorrected accordingly, producing the modern form.

Noun

 * 1) wild foxtail millet