tomentum

/T OW0 M EH1 N T AH0 M/
noun
  1. 1

    A mass of filamentous hairs on the leaf of a plant.

  2. 2

    A covering of fine, soft hairs; a pubescence.

  3. 3

    A network of fine blood vessels between the pia mater and the cerebral cortex.

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