plural of double bubble

(radiology) The presence of two air-filled bubbles in the abdomen, often indicating various pathological conditions. / (aviation) A fuselage formed from two conjoined hulls.

The perennial plant Agastache cana.

(mathematics) A conjecture in the theory of minimal surfaces, stating that the shape that encloses and separates two given volumes and has the minimum possible surface area is a "standard double bubble": three spherical surfaces meeting at angles of 2π/3 on a common circle.