Discernible, a.
Etymology: [L. discernibilis.]
Capable of being discerned by the eye or the understanding; as, a star is discernible by the eye; the identity of difference of ideas is discernible by the understanding. The effect of the privations and sufferings . . . was discernible to the last in his temper and deportment. Macaulay.
Syn. -- Perceptible; distinguishable; apparent; visible; evident; manifest.
Shades of meaning
Fernald has no entry of its own for discernible; he lists it under evident.
Where he writes about it:
Discernible applies to that which is dimly or faintly visible, requiring strain and effort in order to be seen; as, the ship was discernible through the mist. — from evident