megalodon

Etymology

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

noun

1. A species of extinct shark that lived during the Miocene and Pliocene epochs (†Carcharocles megalodon or †Otodus megalodon).
   Throughout the period, toothy giants persisted in the oceans. Perhaps the most spectacular was the megalodon shark. 2018, Tim Flannery, Europe: A Natural History, page 139