foxtail

noun
  1. 1

    The tail of a fox.

  2. 2

    A dry spikelet or spikelet seed and flower cluster of some grasses

  3. 3

    A plant having a part resembling the tail of a fox or such spikelet.

  4. 4

    The last cinders obtained in the fining process.

Source: https://en.wiktionary.org/wiki/foxtail