subframe

noun sub·frame \ ˈsəb-ˌfrām \
variants: or sub-frame

Definition of subframe

plural subframes or sub-frames
: a secondary frame; especially : one that is used for the attachment and support of a finish frame (as of a door or window) or of finish panels (as of a wall)
  • Strictly speaking, the vertical members of a curtain wall's subframe are called mullions, while horizontal members are called transoms.
  • —Jason Alread et al.
  • The rolled steel sections, generally 1/8" thick and 1" - 1 1/2" wide, were used for all the components of the windows: sash, frame, and subframe
  • The Preservation of Historic Architecture: The U.S. Government's Official Guidelines for Preserving Historic Homes

First Known Use of subframe

1866

in the meaning defined above

See Words from the same year
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