This is the 842nd most frequent Russian word.
среды
The Russian word "среды" means "Wednesdays" (plural of Wednesday) or "environments" (plural of environment), depending on the context.
In this context, 'среду' is used in its singular accusative form to indicate a specific day of the week.
Я хожу на занятия каждую среду.
I go to classes every Wednesday.
Here, 'среды' is in the genitive singular form and refers to the 'environment' or 'surroundings' in the context of ecology and health.
Чистота окружающей среды важна для здоровья.
The cleanliness of the environment is important for health.
In this usage, 'среди' (derivative of 'среды') acts as a preposition meaning 'among' or 'amid,' highlighting its variant usage.