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]

Moby Thesaurus II by Grady Ward, 1.0:

131 Moby Thesaurus words for "pap":
   abba, acid-ash diet, albumen, aliment, alimentation, allergy diet,
   bag, batter, bland diet, bonnyclabber, boobs, bosom, breast,
   breasts, brisket, bust, butter, calorie chart, calorie counter,
   chest, clabber, cornstarch, cream, crop, curd, dad, daddy,
   diabetic diet, diet, diet book, dietary, dietetics, dieting, dough,
   dug, egg white, father, foster father, garbage, gaum, gel, gelatin,
   genitor, glair, glop, glue, gluten, goo, gook, goop, governor,
   gruel, gumbo, gunk, high-protein diet, high-vitamin diet, jam,
   jell, jelly, keep, knockers, loblolly, low-carbohydrate diet,
   low-salt diet, macrobiotic diet, mama, mamelon, mamelonation,
   mammary gland, mammilla, mammillation, molasses, mucilage, mucus,
   nenes, nipple, nourishment, nurture, nutriment, old man, pa,
   pabulum, papa, papilla, pappy, paste, pater, paterfamilias,
   patriarch, pigeon breast, pop, pops, porridge, pudding, pulp,
   puree, putty, refection, refreshment, regime, regimen, rob,
   rubbish, salt-free diet, semifluid, semiliquid, sire, size, slop,
   soft diet, soup, spoon victuals, starch, stepfather, sticky mess,
   support, sustenance, syrup, teat, the old man, thorax, tit, tits,
   titties, titty, trash, treacle, udder, ulcer diet, vegetarianism,
   vitamin-deficiency diet



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PAP
       Password Authentication Protocol (RFC 1334)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PAP
       Printer Access Protocol (AppleTalk)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PAP
       ProgrammAblaufPlan (DIN 66001)


The Free On-line Dictionary of Computing (30 December 2018):

PAP

   1.  Password Authentication
   Protocol.

   2.  Printer Access Protocol.

   (1996-03-23)