molekularnej

Molekularnej is a Polish inflected form of the adjective molekularny, meaning "molecular." It is used with feminine singular nouns and appears in several grammatical cases. The base form of the adjective in the nominative feminine singular is molekularna, while molekularnej functions as the genitive singular feminine, the dative singular feminine, and the locative singular feminine.

In practical usage, molekularnej occurs in phrases such as warstwy molekularnej (the molecular layer, genitive) or do warstwie molekularnej (to/by the molecular layer, dative). Other common examples include struktury molekularnej or właściwości molekularnej. The form is chosen to agree with the gender and case of the noun it modifies.

Etymology and scope: the word derives from the noun molekula (molecule) and the standard Polish adjective suffixes, yielding molekularny for masculine forms and molekularna for feminine nominative. Molekularnej, as a case-inflected variant, appears across scientific and technical writing in fields such as chemia molekularna, biologia molekularna, and fizyka molekularna, where precise grammatical agreement is required.

Related terms include molekularny (masculine), molekularna (feminine nominative), and molekularne (neuter/plural forms). While molekularnej itself is a grammatical form rather than a standalone noun, it plays a crucial role in correctly constructing phrases that describe molecular phenomena in Polish.