the terminal through which electric current passes between metallic and nonmetallic parts of an electric circuit / a collector or emitter of electric charge in a semiconducting device

plural of Spires

(electronics) Automatic interchanging of connections to a digital meter when polarity is wrong; a minus sign appears ahead of the value on the digital display if the reading is negative.

(biology) That lives north or south of the equator, but not in the tropics