unilineal
adjective
uni·lin·e·al ˌyü-ni-ˈli-nē-əl 
: tracing descent through either the maternal or paternal line only
Word History
First Known Use
1935, in the meaning defined above
- stepparenting
- stepparentings
- stepparents
- steppe
- steppe cat
- stepped
- stepped (along)
- stepped (on)
- stepped along
- stepped aside
- stepped aside (from)
- stepped aside from
- stepped back
- stepped down
- stepped down (from)
- stepped down from
- stepped footing
- stepped forward
- stepped gable
- stepped gauge
- stepped gear wheel
- stepped in
- stepped into
- stepped key
- stepped on