The story
Coined by Costero and Pomerat (1951), who refer it to Ancient Greek ζείω (zeíō), alternative form of ζέω (zéō, “to boil”) + -osis. The authentic Ancient Greek term would be ζέσις (zésis, “boiling”). The derivation was chosen because blebs are said to "resemble the behavior of a very dense fluid under intense boiling".
Etymology from Wiktionary, CC BY-SA 4.0.