Category: E

A reverberating sound produced when sound waves are reflected back to their source.  

The Indian saw-scaled viper. Its venom contains a prothrombin activator, a potent anticoagulant.  

A genus of flukes characterized by a spiny body and the presence of a collar of spines near the anterior end. They are found in the intestines of many vertebrates, especially aquatic birds. They occasionally occur as accidental parasites in humans.  

An abnormal erythrocyte with multiple, regular, spiny projections from the surface.  

A variety of Echinococcus characterized by development of daughter cysts from the mother cyst.  

A species of tapeworms that infests dogs and other carnivores. Its larva, called a hydatid, develops in other mammals, including humans, and causes the formation of hydatid cysts in the liver or lungs.  

An operation for evacuation of an echinococcal cyst.  

Any of a class of antifungal drugs that block the synthesis of the fungal cell wall.  

A native American perennial herb (purple coneflower) of the family Compositae. Its root and leaf extracts are promoted both for their effects on wound healing and for their impact on the treatment and prevention of respiratory infections.  

The stick tight flea, an important pest of poultry. It collects in clusters on the heads of poultry and in the ears of mammals. It may infest humans, especially children.