Lesionis

Lesionis is the Latin genitive singular form of the noun laesio, from which the English medical term lesion ultimately derives. In medical Latin, laesio denotes injury or damage to tissue, ranging from a wound to a focal pathological change. The form lesionis is used to express possession or association, roughly translating as “of the lesion” in English.

Etymology and linguistic context: Laesio comes from the verb laedo, laedere, meaning to injure or harm. The genitive singular ends in -ionis, and in transliterations can appear as lesionis. In modern English medical writing, lesionis is not used as an independent term; rather it appears within Latin phrases or in the transcription of historical diagnoses.

Usage and examples: Latin phrases that use lesionis include extensio lesionis (“extent of the lesion”) and cavitas lesionis (“cavity of the lesion”). Such phrases are encountered primarily in historical texts or in glossaries that preserve Latin terminology; in everyday clinical writing, English terms like “lesion” and “the extent of the lesion” are preferred.

Notes: Lesionis is not a standalone English term or a recognized medical condition. It functions as a grammatical form within Latin phrases and is preserved mainly for scholarly, historical, or taxonomic contexts involving medical Latin. See also lesion, laesio, medical Latin, and Latin in medicine.