Definitions of dike:

• noun:   a barrier constructed to contain the flow of water or to keep out the sea
• noun:   offensive terms for a lesbian who is noticeably masculine
• verb:   enclose with a dike

  Example: "Dike the land to protect it from water"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #18261)