in taxon ookinete stage Mosby's Medical Dictionary, 8th edition. � 2009, Elsevier. (http://medical-dictionary.thefreedictionary.com/ookinete) Priti Parikh A parasite lifecycle stage of some sporozoans where motile and elongated zygote is formed by the fertilization of the macrogamete during the sexual reproductive phase of the sporozoan life cycle, specifically the malarial parasite Plasmodium. Chris Stoeckert Jie Zheng parasite lifecycle stage parasite organism