Oireellisen

Oireellisen is a Finnish adjective meaning "symptomatic" or "showing symptoms." It is formed from the noun oire ("symptom") and the adjectival suffix -llinen, a common productive element in Finnish that creates adjectives expressing possession of a property. The basic sense denotes that a person, condition or finding is accompanied by observable or reported symptoms.

In medical and everyday usage oireellinen describes patients, infections, reactions or signs that manifest clinically detectable symptoms, as opposed to oireeton ("asymptomatic"). For example, oireellinen potilas refers to a patient with symptoms, and oireellinen infektio denotes an infection that produces symptoms. The word can also be used more broadly to indicate something that is indicative of an underlying issue or shows characteristic signs.

Grammatically, oireellinen behaves like other Finnish adjectives and declines to agree with the noun it modifies (e.g., oireellisen, oireellista). Comparative and superlative forms (oireellisempi, oireellisin) are formed regularly.

Related terms include oire ("symptom"), oireettomuus ("absence of symptoms") and oireellisuus (the quality or state of being symptomatic). In translations and clinical contexts, oireellisen is most commonly rendered into English as "symptomatic."