This is the 14813th most frequent Russian word.
пневмонию
The Russian word "пневмонию" means "pneumonia" in English, an inflammatory condition of the lungs.
Here, 'пневмонией' is in the instrumental case, indicating the cause of the state 'заболел' (got sick).
Я заболел пневмонией и был госпитализирован.
I got pneumonia and was hospitalized.
In this example, 'пневмонию' is in the accusative case, serving as the direct object of the action 'диагностировал' (diagnosed).
Доктор диагностировал у неё пневмонию после обследования.
The doctor diagnosed her with pneumonia after the examination.
Here, 'пневмонии' is in the genitive case, used to specify the condition for which treatment is prescribed.