The full oxford english dictionary includes cill only as a historical variant spelling in the entry for sill He said pilgrims come to walk on the ground where brigid walked and founded an earlier wooden sanctuary — a “church of the oak,” or “cill dara” in irish, giving the name kildare to this town where she was a prominent abbess of a monastic settlement of men and women. As nouns the difference between sill and cill is that sill is (also window sill) a horizontal slat which forms the base of a window while cill is more usual spelling of sill when used in the context of an underwater horizontal member which forms the base of a lock gate on a canal or river. Definition of 'cill' cill in british english (sɪl ) noun british a variant spelling (used in the building industry) for sill (sense 1), sill (sense 2), sill (sense 3), sill (sense 4) Noun [edit] cill (plural cills) alternative form of sill (“a threshold or brink across the bottom of a canal lock for the gates to shut against”). Sill is the correct spelling for the horizontal structural element found at the base of a window or door, whereas cill is an incorrect variant
A sill forms the bottom threshold of a window or doorway. Cill (sɪl) n (architecture) brit a variant spelling (used in the building industry) for sill 1, sill 2, sill 3, sill 4 Cill definition: More usual spelling of <i><a>sill</a></i> when used in the context of an underwater <a>horizontal</a> <a>member</a> which forms the <a>base</a> of a <a>lock</a> <a>gate</a> on a <a>canal</a> or <a>river</a>.
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