An Etymological Dictionary of Astronomy and Astrophysics

General:A small body of gas within a liquid; a thin film of liquid inflated with air or gas.
Astro.:

1. Bubble-like structures of hot ionized gas created in the interstellar medium by the action of the powerful winds of massive stars.
   
2. A giant bubble-like component appearing during the growth of large-scale structures in the early Universe.

Etymology (EN): Bubble, from M.E. bobel, perhaps from M.Du. bobbel.

Etymology (PE): Tangol “bubble,” from štiyâni dialect, maybe from tan “body” + gol “flower,” literally “that which has a delicate body (like a flower).” This etymology is derived from the observation that in Pers. bubble is often likened to a flower: qonce-ye âb, kupale-ye âb, quze-ye âb [Dehxodâ] “water blossom, water flower, water bud."
Hobâb, from Ar. habâb.