1) CCXXI quintupled 2) CCXXI x V 3) Early 12th-century year 4) LXV x XVII 5) Mobile communications vehicle 6) Product of lxv and xvii 7) Roman 1,105 Found on https://www.crosswordclues.com/clue/mcv
MCV: Abbreviation for mean cell volume, the average volume of a red blood cell. This is a calculated value derived from the hematocrit and the red cell count (The hematocrit is the ratio of the volume of red cells to the volume of whole blood while the red cell count is the number of red blood cells in a volume of blood). The normal range for the M... Found on http://www.medterms.com/script/main/art.asp?articlekey=9991
(macrocytosis) Enlarged red blood cells, often seen in chronic alcohol misuse. Example: Detecting macrocytosis in a blood test of a heavy drinker. Found on https://www.alcoholscotland.co.uk