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Definition of PHYLUM
a: a direct line of descent within a group
b: a group that constitutes or has the unity of a phylum; specifically: a primary category in biological taxonomy especially of animals that ranks above the class and below the kingdom — compare division 10
: a group of languages related more remotely than those of a family or stock
: a major group of animals or in some classifications plants sharing one or more fundamental characteristics that set them apart from all other animals and plants and forming a primary category of the animal or plant kingdom <the phylum Arthropoda>