subframe

noun
sub·​frame | \ˈsəb-ˌfrām \
variants: or sub-frame
plural subframes or sub-frames

Definition of subframe 

: 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 subframeThe 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

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The first known use of subframe was in 1866

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