ˈ ̷ ̷ˌfel- noun
Etymology: obsolete English flat fell (from English flat (I) + obsolete English fell, n., action of felling a seam, felled seam, from English fell ) (II) + English seam
: a strong seam with two lines of stitching showing on the right side that is produced by folding one raw edge under the other and stitching it flat or slip-stitching it on the wrong side