Used attributively to describe something relating to or characteristic of a grebe.
Definitions
grebenoun
Any of various small to medium-sized diving birds of the family Podicipedidae, noted for their lobed toes and excellent swimming and diving abilities, typically inhabiting freshwater lakes and ponds.
A pied-billed grebe floated quietly in the middle of the lake.
grebeadjective
Relating to, characteristic of, or belonging to a grebe.