Medical Definition of HPI. history of present illness.What made you want to look up HPI? Please tell us where you read or heard it (including the quote, if possible). View Seen & Heard Highlights from Around the Site. Test Your Vocabulary! Test Your Vocabulary!10 Charming Words for Nasty People.edical Definition of HPI. history of present illness.
parÂ·aÂ·sitÂ·oid. n. An organism, usually an insect, that lives on or in a host organism during some period of its development and eventually kills its host. parâ²aÂ·sitÂ·oidâ² adj.
A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival-it has to be in the host to live, grow and multiply. A parasite cannot live independently. Although a parasite rarely kills the host, in some cases it can happen. The parasite benefits at the expense of the host-the parasite uses the host to gain strength, and the host loses some strength as a result. Parasites, unlike predators, are usually much smaller than their host.