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.
Parasite: A plant or an animal organism that lives in or on another and takes its nourishment from that other organism. Parasitic diseases include infections that are due to protozoa, helminths, or arthropods.For example, malaria is caused by Plasmodium, a parasitic protozoa.arasite: A plant or an animal organism that lives in or on another and takes its nourishment from that other organism. Parasitic diseases include infections that are due to protozoa, helminths, or arthropods.