socket
/ˈsɔkɪt; `sɑkɪt/ n
natural or artificial hollow into which sth fits or in which sth turns （天然的或人造的）承物凹座, 窝（用以容纳某物或某物可在其中转动）; 插口; 插座
the eye socket, ie the hollow in a human or an animal skull for the eye 眼窝
a socket for an electric light bulb 电灯泡插座. => illus 见插图.