from Latin sopōrāt-, ppl. stem of sopōrāre to put asleep, lull, stupefy, etc., from sopor sleep
From: A Medicinal Dispensatory:
Containing the Whole Body of Physick
Composed by the Illustrious Renodaeus,
Englished and Revised by Richard Tomlinson, 1657
Book V. Section Three. Chapter VII. Of Lotion.