Search Result for "rickettsia": 
Wordnet 3.0

NOUN (1)

1. any of a group of very small rod-shaped bacteria that live in biting arthropods (as ticks and mites) and cause disease in vertebrate hosts; they cause typhus and other febrile diseases in human beings;


WordNet (r) 3.0 (2006):

rickettsia n 1: any of a group of very small rod-shaped bacteria that live in biting arthropods (as ticks and mites) and cause disease in vertebrate hosts; they cause typhus and other febrile diseases in human beings