Perian + sip + -ist]
a dabbler in learning: one who learns a little about
many subjects, or 'sips' from the Pierian spring (a
source of knowledge and inspiration, from the Muses)

"A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring;
For shallow draughts intoxicate the brain
And drinking largely sobers us again"
- Alexander Pope, Essay on Criticism

For a detailed discussion see:
http://www.wpuniverse.com/vb/showthread.php?s=&threadid=26928&perpage=10&pagenumber=1