lisääydy

Lisääydy is a Finnish linguistic form that is not part of modern standard Finnish. It appears only very rarely in historical texts and some dialectal sources, and its exact grammatical status in those sources is not uniformly documented. Because it is not an established part of contemporary Finnish grammar, lisääydy is typically treated as a marginal or archaic form rather than a productive contemporary word.

Etymology and meaning in attested material suggest a connection with the root lisää- meaning “more” and with the verb lisääntyä, which means “to increase” or “to reproduce.” In this context lisääydy would be interpreted as related to increasing, enlarging, or joining in some way, depending on the surrounding syntax. However, due to limited and divergent attestations, researchers do not assign a single, unambiguous meaning or a clear mood, tense, or aspect to lisääydy in historical usage.

In modern Finnish, speakers would express related ideas using standard forms such as lisääntyä (to increase or reproduce) or lisätä (to add). Because lisääydy is not regularly documented or taught, it should be treated as a historical or dialectal variant rather than a living part of the language. For analysis, it is advisable to consult primary dialect corpora or historical grammars where the form has appeared. See also lisääntyä, lisätä, Finnish dialects.