single parent 
noun
A person bringing up a child or children without a partner: [as modifier]: single-parent families...
- The step-family may solve the poverty risks that haunt the single-parent family.
- In single-parent families or families where both parents are at sea, the children are signed over to a guardian.
- Young women who have children out of wedlock are much less likely to marry as they age and much more likely to bring up their children in a single-parent family.
- runability
- run a blockade
- runabout
- run across
- run a drum
- run afoul of
- run after
- run against
- runagate
- run along
- run a mile
- run-and-gun
- run-and-shoot
- run an errand
- runanga
- runaround
- run around with (also run with)
- run at
- run a temperature
- runathon
- run-a-thon
- run a tight ship
- run away
- runaway
- runaway knock