1) Lymphopenia 
Lymphocytopenia, or lymphopenia, is the condition of having an abnormally low level of lymphocytes in the blood. Lymphocytes are a white blood cell with important functions in the immune system. The opposite is lymphocytosis, which refers to an excessive level of lymphocytes. Lymphocytopenia may be present as part of a pancytopenia, when the total...
A condition in which there is a lower-than-normal number of lymphocytes (a type of white blood cell) in the blood. Also called lymphocytic leukopenia and lymphopenia.
A condition in which the blood contains an abnormally low number of lymphocytes. ... (09 Oct 1997) ... 
(lim″fo-si″to-pe´ne-ә) reduction of the number of lymphocytes in the blood; called also lymphopenia.
a deficiency of lymphocytes.
Type: Term Pronunciation: lim′fō-sī′tō-pē′nē-ă Synonyms: lymphopenia
[n] - an abnormally small number of lymphocytes in the circulating blood
lymphopenia, lymphopenic, lymphocytopenia A reduction, relative or absolute, in the number of lymphocytes in circulating blood.
lymphopenia noun an abnormally small number of lymphocytes in the circulating blood