1. 
[syn: palpable, tangible]
2.  can be felt by palpation; 
- Example: "a palpable tumor"
The Collaborative International Dictionary of English v.0.48:
Palpable \Pal"pa*ble\, a. [F. palpable, L. palpabilis, fr.
   palpare to feel, stroke; cf. palpus the soft palm of the
   hand.]
   1. Capable of being touched and felt; perceptible by the
      touch; as, a palpable form. --Shak.
      [1913 Webster]
            Darkness must overshadow all his bounds,
            Palpable darkness.                    --Milton.
      [1913 Webster]
   2. Easily perceptible; plain; distinct; obvious; readily
      perceived and detected; gross; as, palpable imposture;
      palpable absurdity; palpable errors. "Three persons
      palpable." --P. Plowman.
      [1913 Webster]
            [Lies] gross as a mountain, open, palpable. --Shak.
      [1913 Webster]
            A hit, A very palpable hit.           --Shak.
                                                  (Hamlet)
      [1913 Webster] -- Pal"pa*ble*ness, n. -- Pal"pa*bly,
      adv.
      [1913 Webster]
WordNet (r) 3.0 (2006):
palpable
    adj 1: capable of being perceived; especially capable of being
           handled or touched or felt; "a barely palpable dust";
           "felt sudden anger in a palpable wave"; "the air was warm
           and close--palpable as cotton"; "a palpable lie" [syn:
           palpable, tangible] [ant: impalpable]
    2: can be felt by palpation; "a palpable tumor"
Moby Thesaurus II by Grady Ward, 1.0:
57 Moby Thesaurus words for "palpable":
   apparent, appreciable, arresting, believable, certain, clear,
   clear as crystal, colorable, concrete, credible, crystal-clear,
   detectable, discernible, distinct, evident, explicit, express,
   indisputable, indubitable, manifest, material, noticeable,
   observable, obvious, open-and-shut, ostensible, patent,
   perceivable, perceptible, perspicuous, plain, plain as day,
   plausible, ponderable, positive, real, remarkable, seeable,
   seeming, self-evident, self-explaining, self-explanatory, sensible,
   solid, straightforward, striking, substantial, substantive, sure,
   tactile, tangible, to be seen, touchable, unequivocal,
   unmistakable, visible, weighable