A perennial woody plant at least 20 feet (6 meters) in height at maturity, having an erect stem or trunk and a well-developed crown or leaf canopy.

A data structure in which each element may be logically followed by two or more other elements, there is one element with no predecessor, every other element has a unique predecessor, and there are no circular lists.

A set of connected circuit branches that includes no meshes; responds uniquely to each of the possible combinations of a number of simultaneous inputs. Also known as decoder.

A connected graph contained in a given connected graph having all the vertices of the original but without any closed circuit.

A projecting treelike aggregate of crystals formed at areas of high local current density in electroplating.