Wordnet 3.0
ADJECTIVE (1)
1. 
 perceptible by the senses or intellect; 
- Example: "things happen in the earth and sky with no discernible cause"- Example: "the newspaper reports no discernible progress in the negotiations"- Example: "the skyline is easily discernible even at a distance of several miles"[syn: discernible, discernable]
WordNet (r) 3.0 (2006):
discernable
    adj 1: perceptible by the senses or intellect; "things happen in
           the earth and sky with no discernible cause"; "the
           newspaper reports no discernible progress in the
           negotiations"; "the skyline is easily discernible even at
           a distance of several miles" [syn: discernible,
           discernable] [ant: indiscernible]