Definition of soleplates:
(n) :
The flat metal plate forming the underside of an iron (for ironing laundry).
(n) :
A flat surface on which the sole of the foot rests.
(n) :
The base timber in the framing for a wall, to which the studs or posts are attached and on which they rest.
(n) :
Any baseplate on which machinery rests, especially one to which things are bolted.
(n) :
A sole (timber).
(n) :
The back wall of a bucket on a water wheel (which is omitted in certain designs).