soffit

sof·fit  (sft)

n.

The underside of a structural component, such as a beam, arch, staircase, or cornice.

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[French soffite, from Italian soffitto, from Vulgar Latin *suffctus, past participle of suffgere, to fasten beneath; see suffix.]

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soffit [ˈsɒfɪt]

n

1. (Fine Arts & Visual Arts / Architecture) the underside of a part of a building or a structural component, such as an arch, beam, stair, etc.

2. (Engineering / Civil Engineering) Also called crown, vertex the upper inner surface of a drain or sewer Compare invert [6]

[via French from Italian soffitto, from Latin suffixus something fixed underneath, from suffīgere, from sub- under + fīgere to fasten]

Thesaurus

Noun

1.

soffit - the underside of a part of a building (such as an arch or overhang or beam etc.) side - an extended outer surface of an object; "he turned the box over to examine the bottom side"; "they painted all four sides of the house"