1º_ Mechanical part to be pressed with a finger that is connected to a machine, musical instrument, electrical circuit, . . . and produces a change of state in them. It comes from the Latin tegula, ae ("tile for roofing", because of its shape). See button, push button. 2º_ It is also a feminine name of Theclo. 3º_ Valencianism for "neurotic, hypochondriac, obsessive, heavy, annoying, . . . " . 4th_ Feminine of teclo ("elder") .