soffit

[ sof-it ]
/ ˈsɒf ɪt /

noun Architecture.

the underside of an architectural feature, as a beam, arch, ceiling, vault, or cornice.

RELATED WORDS

Origin of soffit

1605–15; < French soffite < Italian soffitto < Vulgar Latin *suffīctus, for Latin suffīxus; see suffix
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British Dictionary definitions for soffit

soffit

/ (ˈsɒfɪt) /

noun

the underside of a part of a building or a structural component, such as an arch, beam, stair, etc
Also called: crown, vertex the upper inner surface of a drain or sewerCompare invert (def. 6)

Word Origin for soffit

C17: via French from Italian soffitto, from Latin suffixus something fixed underneath, from suffīgere, from sub- under + fīgere to fasten
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012