mucrones

/M Y UW1 K R OW1 N Z/
noun
  1. 1

    A pointed end, often sharp, abruptly terminating an organ, such as a projection at the tip of a leaf; the posterior tip of a cuttlebone; or the distal part of the furcula in Collembola.

Source: https://en.wiktionary.org/wiki/mucro, https://en.wiktionary.org/wiki/mucrones