(zoology) A glandular sac opening into the cloaca of a bird, producing B cells.

(anatomy) Synonym of lesser sac

(meteorology, ornithology) A large quantity of birds simultaneously taking off from a single location and flying outwards, producing a radar signature closely resembling that from a microburst.

A surname from German.

plural of omental bursa

(idiomatic) To start crying uncontrollably and intensely.