Sentence:  [T]he majority of human beings born under the influence of Mars—the <WSD>Martians</WSD> (or "Martials")—are heavily built but physically strong. [...] A male <WSD>Martian</WSD> is generally a great favorite with the ladies and is apt to be rather quick and unscrupulous in his courtship methods. He is not a sentimental lover. A bad <WSD>Martian</WSD> is a loud, fatiguing talker and a braggard. 
Meaning of the word marked with <WSD> tags:  A person under the astrological influence of the planet Mars.