male
The German word 'männlich' is used to describe something or someone as male. It is the equivalent of the English word 'male'. It can be used to describe gender, as in 'Er ist männlich' (He is male), or to describe characteristics, as in 'Das ist ein männlicher Hund' (That is a male dog).
He is very masculine.
This sentence can be used to describe the strength and masculinity of a man. It simply defines him to be high on manly features.
The male gender is strong.
This German sentence is an observation or a general statement about masculinity. It speaks about the strength associated with the male gender.
The lion is the male animal of the group.
In this context, 'männlich' is used to denote the male member of a group of animals, here specifically, a lion.