bels

noun
  1. 1

    A tropical fruit tree from India, Aegle marmelos.

  2. 2

    The fruit of the tree, also called the wood apple.

noun
  1. 1

    A measure of relative power, defined as log10(P 1/P 2), where P1 and P2 are the measured and reference power respectively.

Source: https://en.wiktionary.org/wiki/bael, https://en.wiktionary.org/wiki/bel, https://en.wiktionary.org/wiki/bels