What does "harp" mean?

Additional senses

1. 2.A grain sieve. [Scot.] Æolian harp. See under Æolian. Harp seal (Zoöl.), an arctic seal (Phoca Groenlandica). The adult males have a light-colored body, with a harp-shaped mark of black on each side, and the face and throat black. Called also saddler, and saddleback. The immature ones are called bluesides. -- Harp shell (Zoöl.), a beautiful marine gastropod shell of the genus Harpa, of several species, found in tropical seas. See Harpa.
2. 3.To play on the harp. I heard the voice of harpers, harping with their harps. Rev. xiv.
3. 4.2. To dwell on or recur to a subject tediously or monotonously in speaking or in writing; to refer to something repeatedly or continually; -- usually with on or upon. "Harpings upon old themes." W. Irving. Harping on what I am, Not what he knew I was. Shak. To harp on one string, to dwell upon one subject with disagreeable or wearisome persistence. [Collog.]
4. 5.To play on, as a harp; to play (a tune) on the harp; to develop or give expression to by skill and art; to sound forth as from a harp; to hit upon. Thou 'harped my fear aright. Shak.