step·par·ent 
(stĕppâr′ənt, -păr′-)
(stĕppâr′ənt, -păr′-)n.
A person who is not one's biological parent but has married one's parent after one's birth.
- stratospherically
- stratovolcano
- stratum
- stratum corneum
- stratus
- Strauss
- Strauss
- Strauss
- Stravinsky
- straw
- strawberry
- strawberry blond
- strawberry blonde
- strawberry bush
- strawberry mark
- strawberry roan
- strawberry tomato
- strawberry tree
- strawboard
- straw boss
- straw donor
- strawflower
- straw-hat
- straw in the wind
- straw man