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| a supporting part of a structure; the area of contact between a supporting beam and other underlying support |
| a vault with a circular plan and usually in the form of a portion of a sphere |
| soffit (ˈsɒfɪt) | |
| —n | |
| 1. | the underside of a part of a building or a structural component, such as an arch, beam, stair, etc |
| 2. | Compare invert crown, Also called: vertex the upper inner surface of a drain or sewer |
| [C17: via French from Italian soffitto, from Latin suffixus something fixed underneath, from suffīgere, from sub- under + fīgere to fasten] | |