(Latin) ultra, "beyond" + mare, "sea" + vitae, "life," thus meaning "the sea of life beyond" or "superior." A reference to the superior worlds, also called heaven. Compare with:
"And Elohim called the firmament שמים (Heaven)." —Genesis 1:8
The Hebrew word translated here as heaven is שמים schamayim, composed of ש shin (fire) plus מים mayim, "water, sea."