comae

/K OW0 M EY1/
noun
  1. 1

    A cloud of dust surrounding the nucleus of a comet.

  2. 2

    A defect characterized by diffuse, pear-shaped images that in an ideal image would appear as points.

  3. 3

    A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.

Source: https://en.wiktionary.org/wiki/coma, https://en.wiktionary.org/wiki/comae