WordWeb Online

1. Capable of being perceived; especially capable of being handled, touched or felt
   "felt sudden anger in a palpable wave"; "the air was warm and close--palpable as cotton"; "a palpable lie"; "a barely palpable dust";
   - tangible
    
2. (medicine) can be felt by palpation
   "a palpable tumour"
    
3. Clearly revealed to the mind or the senses or judgment
   "a palpable lie";
   - apparent, evident, manifest, patent, plain, unmistakable, unmistakeable
    
4. So intense as to be almost touched or felt
   "there was a palpable sense of joy in the air"

See also: intense, obvious, perceptible

Encyclopedia: Palpable