See palpable in Webster's New World Roget's A-Z Thesaurus II
Discernible by touch:
tactile, tangible, touchable. See touchCapable of being noticed or apprehended mentally:
appreciable, detectable, discernible, distinguishable, noticeable, observable, perceivable, perceptible, ponderable, sensible. See knowledgeLearn more about palpable