potsherd n 1: a shard of pottery
Potsherd \Pot"sherd`\, n. [Pot + sherd or shard.] A piece or fragment of a broken pot. --Job ii. 8. [1913 Webster]
Potsherd a "shred", i.e., anything severed, as a fragment of earthenware (Job 2:8; Prov. 26:23; Isa. 45:9).