cirri

/S IH1 R IY0/
noun
  1. 1

    A tendril.

  2. 2

    A thin tendril-like appendage.

  3. 3

    A principal high-level cloud type characterised by white, delicate filaments or wisps, of white (or mostly white) patches, or of narrow bands, found at an altitude of above 7000 metres.

Source: https://en.wiktionary.org/wiki/cirri, https://en.wiktionary.org/wiki/cirrus