1. The open sea or ocean, especially the deep water away from the coast
The ship sailed into the pelagos, far from any land.
O navio navegou em direção ao alto-mar, longe de qualquer terra.
2. In biology and oceanography, the water column of the ocean rather than the sea floor or coastal areas
Pelagic organisms live in the pelagos rather than on the seabed.
Os organismos pelágicos vivem no oceano aberto em vez de no fundo do mar.