Wiktionary
a. Having an abnormally low number of platelets in one's blood.
WordNet
Wikipedia
Usage examples of "thrombocytopenic".
Nemes withdrew the needle and examined the blood within: dangerous levels of C-H-OH -- Lusians frequently were at risk from high cholesterol -- as well as a low platelet count suggesting the presence of incipient immune thrombocytopenic purpura, probably brought about by the trooper's early years in hard-radiation environments on any of several garrison worlds, a blood alcohol level of 122 mg/100 ml -- the trooper was drunk, although his alcoholic past probably allowed him to hide most of the effects -- and -- voilá!
Nemes withdrew the needle and examined the blood within: dangerous levels of C-H-OH -- Lusians frequently were at risk from high cholesterol -- as well as a low platelet count suggesting the presence of incipient immune thrombocytopenic purpura, probably brought about by the trooper's early years in hard-radiation environments on any of several garrison worlds, a blood alcohol level of 122 mg/100 ml -- the trooper was drunk, although his alcoholic past probably allowed him to hide most of the effects -- and -- voilá.