Etymology
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emu (n.)

large Australian three-toed bird, 1610s, probably from Portuguese ema "crane, ostrich" (which is of unknown origin), perhaps based on a folk-etymology of a native name.

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Definitions of emu

emu (n.)
any of various systems of units for measuring electricity and magnetism;
Synonyms: electromagnetic unit
emu (n.)
large Australian flightless bird similar to the ostrich but smaller;
Synonyms: Dromaius novaehollandiae / Emu novaehollandiae
From wordnet.princeton.edu