chameleons

/CH AH0 M EH1 L IY0 AH0 N Z/
noun
  1. 1

    A small to mid-size reptile, of the family Chamaeleonidae, and one of the best known lizard families able to change color and project its long tongue.

  2. 2

    A person with inconstant behavior; one able to quickly adjust to new circumstances.

  3. 3

    A hypothetical scalar particle with a non-linear self-interaction, giving it an effective mass that depends on its environment: the presence of other fields.

Source: https://en.wiktionary.org/wiki/chameleon, https://en.wiktionary.org/wiki/chameleons