Englishfor English speakers
Er
—
noun
(= erbium)
a trivalent metallic element of the rare earth group; occurs with yttrium
ER
—
noun
(= emergency room)
a room in a hospital or clinic staffed and equipped to provide emergency care to persons requiring immediate medical treatment
sich
noun
—
administrative and military centre for Cossacks
den
Noun
—
A den is a place where a wild animal lives.
The wolf went back to his den to sleep after a day of hunting.
—
A den is a small cave in the side of a hill.
an
Determinative
—
An (or a) is used when the following word could be any of a certain type.
I just ate an apple.
It is indeed an honor to have met you today.