pancytopenia Syllabification: (pan·cy·to·pe·ni·a)Pronunciation: /ˌpansītəˈpēnēə/Definition of pancytopenia noun Medicine deficiency of all three cellular components of the blood (red cells, white cells, and platelets). Origin: mid 20th century: from pan- 'all' + cyto- 'cell' + Greek penia 'poverty, lack'pancytopenia in other Oxford dictionaries Definition of pancytopenia in the British & World English dictionary