noun: hybrid; plural noun: hybrids
1. Biology
the offspring of two plants or animals of different species or varieties, such as a mule (a hybrid of a donkey and a horse).
"a hybrid of wheat and rye"
2.
a thing made by combining two different elements; a mixture.
"the final text is a hybrid of the stage play and the film"

adjective: hybrid
1.
of mixed character; composed of mixed parts.
"Mexico's hybrid postconquest culture"

I don't think that you can safely define Hybrid inside of this game when there are currently no Hybrid characters or clear communications regarding what a Hybrid will be. A BRD is clearly defined as a DPS, currently.