Ancient Egyptians called it "the plant of immortality" (4)

I believe the answer is:

aloe

(Other definitions for aloe that I've seen before include "Succulent plant (may be bitter!)" , "Fleshy-leaved plant" , ". . . . vera, soothing plant" , "Plant source of purgative drug" , "Succulent plant (4) 5532" .)

I've seen this clue in the Universal.

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