What is the X in X-mas?
1550s, abrecock, from Catalan abercoc, related to Portuguese albricoque, from Arabic al-birquq, through Byzantine Greek berikokkia from Latin (malum) praecoquum "early-ripening (fruit)" (see precocious). Form assimilated to French abricot.
Latin praecoquis early-ripe, can probably be attributed to the fact that the fruit was considered a variety of peach that ripened sooner than other peaches .... [Barnhart]The older Latin name for it was prunum Armeniacum or malum Armeniacum, in reference to supposed origin in Armenia. As a color name, first attested 1906.