double bubble

Noun

 * 1)  The presence of two air-filled bubbles in the abdomen, often indicating various pathological conditions.
 * 2)  A fuselage formed from two conjoined hulls.
 * 3)  Overtime paid at twice the normal rate.
 * 4)  A certain meeting of spherical surfaces, relevant to the double bubble conjecture.
 * 1)  A certain meeting of spherical surfaces, relevant to the double bubble conjecture.
 * 1)  A certain meeting of spherical surfaces, relevant to the double bubble conjecture.