Merriam-Webster's Collegiate® Dictionary, 11th Edition
HARP
I. noun
Etymology: Middle English, from Old English hearpe; akin to Old High German harpha harp Date: before 12th century a plucked stringed instrument consisting of a resonator, an arched or angled neck that may be supported by a post, and strings of graded length that are perpendicular to the soundboard, something resembling a harp, harmonica 2, harpist noun
II. intransitive verb Date: before 12th century to play on a harp, to dwell on or recur to a subject tiresomely or monotonously