[sock.et] n [ME soket, fr. AF, dim. of OF soc plowshare, of Celt origin; akin to MIr soc plowshare, snout; akin to OE sugu sow--more at sow] (15c): an opening or hollow that forms a holder for something "an electric bulb ~" "the eye ~"
[2]socket vt (1533): to provide with or support in or by a socket