Sentence:  ... The angelick blast / Filled all the regions: from their blisful bowers / Of <WSD>amarantine</WSD> shade, fountain or spring, / By the waters of life, where'er they sat / In fellowships of joy, the sons of light / Hasted, resorting to the summons high 
Meaning of the word marked with <WSD> tags:  Unfading, eternal, immortal, infinite.