mitochondria

/M AY0 T AH0 K AA1 N D R IY0 AH0/
noun
  1. 1

    A spherical or ovoid organelle found in the cytoplasm of eukaryotic cells and containing genetic material separate from that of the host; it is responsible for the conversion of food to usable energy in the form of ATP.

noun
  1. 1

    (sometimes proscribed) mitochondrion

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Source: https://en.wiktionary.org/wiki/mitochondria, https://en.wiktionary.org/wiki/mitochondrion