What is the meaning of Pitcher_plant?

Any of various insectivorous plants of the genera Sarracenia, Darlingtonia, Heliamphora (in order Ericales); Nepenthes (in order Caryophyllales), or Cephalotus (in order Oxalidales) that have pitcher-like leaves or parts of leaves with slippery sides that attract and trap insects.

Source: wiktionary.org