Sentence:  Where the inſulting ſtreams of Chaos roar, / Where boiſt'rous waves the rugged ſhores ſurround, / And ſtorms and whirlwinds in the air abound, / There meet two rivals of <WSD>Neptunian</WSD> race, / Hoſtilities begin with fierce grimace: [...] 
Meaning of the word marked with <WSD> tags:  Of or pertaining to water or the sea.