Chris Lee talked to the alpha-male action hero about what made him put down his dukes for the role.
They gave a sedative to Methos, the alpha-male wolf, because he seemed particularly anxious.
a domineering man; the dominant member in a group of males, esp. animals
Alpha male traits have been widely seen recently in American politics.
from first letter of the Greek alphabet, often used as an adjective to describe males and females of species who rank first in a group