Architecture. a monolithic reinforced-concrete structure having walls and floors in the form of slabs.
Building Trades. a window frame with pockets for sash weights.
Origin of box frame
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for box frame
A cargo-cover of light canvas not only closely fits the bottom and sides of the box-frame but overlaps the top.True Tales of Arctic Heroism in the New World|Adolphus W. Greely