(mathematics) In a partially ordered set, a non-unit element that has no element above it other than the unit (assuming that the poset has a top element, its "unit").

(biochemistry) A soluble seven-protein complex which is a precursor of coat protein I (COPI), which plays a key role in Golgi apparatus vesicle formation

plural of coatomer

(mathematics) Synonym of coatomistic

(mathematics) Of a set: such that every element is the greatest lower bound of a set of coatoms.