Ornithosis

Part of speech: noun

Definitions

1. A disease caused by Chlamydia psittaci affecting birds that can also infect humans, leading to respiratory symptoms and other complications
2. An infection from a specific bacterium primarily found in birds, which can result in flu-like illness in humans if contracted
3. A transmissible avian disease due to Chlamydia that may manifest in humans as pneumonia or similar respiratory disorders

Etymology: Ornithosis is built from two Greek elements. "Ornitho-" comes from "ornis" (genitive "ornithos"), meaning "bird," and "-osis" is a suffix used in Greek-derived medical terms for a diseased or abnormal condition, so the whole word means something like "a bird-caused disease." The pattern is a modern one: the word is a technical coinage from classical roots, not a term that Greek physicians used for an infection. The suffix does a lot of the work here. "-osis" appears in many medical words, such as "tuberculosis" and "neurosis," and it signals a process or condition rather than a single object. Pairing it with "ornitho-" tells a reader at once that the illness is connected to birds, which is why the term is used for infections passed from birds to people. The word itself is a plain piece of scientific naming, and its parts are transparent to anyone who knows a little Greek.

Synonyms: avian disease, bird disease, pigeon fever, parrot fever, bird flu