aleuron

/AH0 L UW1 R AA0 N/
noun
  1. 1

    The protein content of the embryo, endosperm, or perisperm of cereals, in the form of minute particles.

  2. 2

    The outer layer (and its major cell type and its specialized protein) of the endosperm.

Source: https://en.wiktionary.org/wiki/aleuron, https://en.wiktionary.org/wiki/aleurone