Sentence:  What was that <WSD>snaky</WSD>-headed Gorgon shield / That wise Minerva wore, unconquered virgin, / Wherewith she freezed her foes to congealed stone, / But rigid looks of chaste austerity, / And noble grace that dashed brute violence / With sudden adoration and blank awe? 
Meaning of the word marked with <WSD> tags:  Covered with serpents; having serpents.