The Collaborative International Dictionary of English v.0.48:

Pap \Pap\, n. [Cf. D. pap, G. pappe, both perh. fr. L. papa,
   pappa, the word with which infants call for food: cf. It.
   pappa.]
   1. A soft food for infants, made of bread boiled or softened
      in milk or water.
      [1913 Webster]

   2. Hence: Any speech, writing, or idea lacking substance, or
      of trivial content; oversimplified, trite, or worthless
      ideas.

   Syn: pablum, drivel, twaddle.
        [PJC]

   3. Nourishment or support from official patronage; as,
      treasury pap. [Colloq. & Contemptuous]
      [1913 Webster]

   4. The pulp of fruit. --Ainsworth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pap \Pap\, v. t.
   To feed with pap. --Beau. & Fl.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pap \Pap\, n. [Cf. OSw. papp. Cf. Pap soft food.]
   [1913 Webster]
   1. (Anat.) A nipple; a mammilla; a teat. --Dryden.
      [1913 Webster]

            The paps which thou hast sucked.      --Luke xi. 27.
      [1913 Webster]

   2. A rounded, nipplelike hill or peak; anything resembling a
      nipple in shape; a mamelon. --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pap
    n 1: worthless or oversimplified ideas [syn: pap, pablum]
    2: a diet that does not require chewing; advised for those with
       intestinal disorders [syn: soft diet, pap, spoon food]
    3: the small projection of a mammary gland [syn: nipple,
       mammilla, mamilla, pap, teat, tit]

The Free On-line Dictionary of Computing (19 January 2023):

PAP

   1.  Password Authentication
   Protocol.

   2.  Printer Access Protocol.

   (1996-03-23)