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2.
A nickname for Arkadelphia, a small town in Clark County, Arkansas. It is best known for its two universities, Ouachita Baptist University and Henderson State University.
Ted: I hear Clark County just went wet.

Bob: Yep, I'm heading over to the delph to grab some booze.
by darthawesum March 02, 2011
 
1.
An abbreviation for the city of Philadelphia. Generally used by those familiar with Philadelphia who find the abbreviation "Philly" to be tired and overused.
Girl: Sooo, what did you do this weekend?!

Dude: On Friday I spent a lovely evening in the 'delph, and then the rest of the weekend I attended a jeans-folding seminar in the 'burgh.

Girl: I'm majorly jeal!
by coco__chanel October 02, 2010