1º_ Strong and brave man. It's the way Rodrigo Diaz de Vivar was treated. It comes from the archaic Spanish Çidi who took it from Arabic 1587; 1610; 1583; ( seiyid "lord, leader, form of respect") . 2º_ As an acronym it has several developments, such as "Research and Documentation Center", "Coalition of the Democratic Left", "International Dance Council", "disseminated intravasal coagulation", "right internal carotid", "right lower quadrant", . . . 3º_ 'CID' is the IATA code for The Eastern Iowa airport in Cedar Rapids ( state of Iowa , USA).
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