megalodon

From Ancient Greek μεγάλος (megálos, “big”) + ὀδών (odṓn, “tooth”); coined (as a specific epithet) by Swiss scientist Louis Agassiz in 1843; equivalent to megalo- +‎ -don.

A giant Megalodon tooth with great white shark teeth

megalodon (plural megalodons)

1. A species of extinct shark that lived during the Miocene and Pliocene epochs (†Otodus megalodon).
   • 2018, Tim Flannery, Europe: A Natural History, page 139:

     Throughout the period, toothy giants persisted in the oceans. Perhaps the most spectacular was the megalodon shark.

• megatooth

• moonglade