Pediculi

Part of speech: noun

Definitions

1. A type of parasitic insect that inhabits the human body, specifically known for infesting hair and causing discomfort
2. An umbrella term for lice, including head lice and body lice, which feed on human blood
3. Referring to small, wingless insects that are notorious for spreading diseases and causing itching among their hosts

Etymology: "Pediculi" is simply the Latin plural of "pediculus," so the English word is a borrowing of a Latin plural rather than a form English built for itself. The Latin singular "pediculus" was a diminutive built from "pēdis," the genitive of "pēs" meaning "foot," with the suffix "-culus" giving a sense of "little." A louse was, in effect, a "little foot," a name that points to the insect's small, clinging legs. English took the Latin form directly, so the word keeps the plural ending "-i" that Latin used for its second-declension nouns. Because it was borrowed rather than inherited through French, it appears as a learned scientific-style term, used wherever a writer wants a single neutral label covering the several species that infest humans.