The Collaborative International Dictionary of English v.0.48:

Potsherd \Pot"sherd`\, n. [Pot + sherd or shard.]
   A piece or fragment of a broken pot. --Job ii. 8.
   [1913 Webster]

WordNet (r) 3.0 (2006):

potsherd
    n 1: a shard of pottery

Easton's 1897 Bible Dictionary:

Potsherd
   a "shred", i.e., anything severed, as a fragment of earthenware
   (Job 2:8; Prov. 26:23; Isa. 45:9).