ground·sill 
(groundsĭl′) also ground·sel (groundsəl, groun-)
(groundsĭl′) also ground·sel (groundsəl, groun-)n.
The horizontal timber nearest the ground in the frame of a building.
- deterioration
- deteriorative
- determent
- determinable
- determinableness
- determinably
- determinacy
- determinant
- determinate
- determinately
- determinateness
- determinater
- determination
- determinative
- determinatively
- determine
- determined
- determinedly
- determinedness
- determiner
- determinism
- determinist
- deterministic
- deterministically
- deterrable