Cognatus | Webster's Dictionary of the English Language

cognatus
co-gnātus, a, um, adj. [natus, nascor], I sprung from the same stock , related by blood , kindred;...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
cognatus
cōgnātus (1) adj.com- + GEN-, sprung from the same stock, related by blood, kindred : mihi: patres...

An Elementary Latin Dictionary