kind of Austrian pastry, 1893, from German Strudel, literally "eddy, whirlpool," from Old High German stredan "to bubble, boil, whirl, eddy," from PIE verbal stem *ser- "to flow" (see serum).
c. 1600, "blister or swelling," imitative. Also used for "bubble" (1640s), "protuberance on a cell surface" (1962). Compare blob. "In relation to blob, bleb expresses a smaller swelling" [OED].
"to spring, rise, gush," Old English wiellan (Anglian wællan), causative of weallan "to boil, bubble up, rise (in reference to a river)" (class VII strong verb; past tense weoll, past participle weallen), from Proto-Germanic *wellanan "to roll" (source also of Old Saxon wallan, Old Norse vella, Old Frisian walla, Old High German wallan, German wallen, Gothic wulan "to bubble, boil"), from PIE root *wel- (3) "to turn, revolve," on notion of "roiling or bubbling water."
1590s, "burning, glowing, hot," from Latin fervidus "glowing, burning; vehement, fervid," from fervere "to boil, glow" (from PIE root *bhreu- "to boil, bubble, effervesce, burn"). Figurative sense of "impassioned" is from 1650s. Related: Fervidly; fervidness.
type of ornament worn by the ancient Romans, especially a protective amulet worn around the neck by children, 1876, from Latin bulla (plural bullae) "round swelling, knob," literally "bubble" (see bull (n.2)).
Old English beorma "yeast, leaven," also "head of a beer," from Proto-Germanic *bhermen- "yeast" (source also of Dutch berm, Middle Low German barm), from suffixed form of PIE root *bhreu- "to boil, bubble, effervesce, burn."
mid-14c., "warmth or glow of feeling," from Old French fervor "heat; enthusiasm, ardor, passion" (12c., Modern French ferveur), from Latin fervor "a boiling, violent heat; passion, ardor, fury," from fervere "to boil; be hot" (from PIE root *bhreu- "to boil, bubble, effervesce, burn").