Webster's English Dictionary

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soffit

sof.fit \'sa:f-*t\ n [F soffite, fr. It soffitto, fr. (assumed) VL 
   suffictus, pp.]of L suffigere to fasten underneath - more at SUFFIX : the 
   underside of a part or member of a building (as of an overhang or st 
   aircase); esp : the intrados of an arch