Merriam-Webster's Collegiate® Dictionary, 11th Edition
TROWEL
I. noun
Etymology: Middle English truel, from Anglo-French, from Late Latin truella, from Latin trulla ladle
Date: 13th century
any of various hand tools used to apply, spread, shape, or smooth loose or plastic material,
II. transitive verb (-eled or -elled; -eling or -elling)
Date: circa 1670
to smooth, mix, or apply with or as if with a trowel, troweler noun