padajacej
Padającej is the feminine genitive singular form of the present active participle padający, derived from the verb padać, meaning to fall. In Polish grammar, present participles function as adjectives or adjective-like modifiers that express simultaneous or ongoing action relative to the noun they describe. The form padającej appears when the governing noun is feminine and in a case that requires a genitive or related ending.
The form is used to describe a feminine noun in contexts where a participial modifier must agree
Padającej is part of a broader system of Polish present participles, which includes padający (masculine nominative),
See also Polish grammar, present active participles, padający.