Describing a situation in which there are only two choices. / Describing a situation in which there is a choice between two different plans of action, but both together are not possible

(organic chemistry) The organoboron compound 3-[[(3S)-3-(aminomethyl)-1-hydroxy-3H-2,1-benzoxaborol-7-yl]oxy]propan-1-ol

A person employed to operate the jigger (horizontal lathe used in producing flatware).

The theory and study of the safe storage, cataloguing and retrieval of documents and items.