calamus

/K AE1 L AH0 M AH0 S/
noun
  1. 1

    The sweet flag, Acorus calamus.

  2. 2

    A quill; the hard, horny, hollow, and more or less transparent part of the stem or scape of a feather.

noun
  1. 1

    An abnormal connection or passageway between organs or vessels that normally do not connect.

  2. 2

    A tube, a pipe, or a hole.

  3. 3

    The tube through which the wine of the Eucharist was once sucked from the chalice.

Source: https://en.wiktionary.org/wiki/calamus, https://en.wiktionary.org/wiki/fistula