phylum
noun [ C ] biology specialized uk/ˈfaɪ.ləm/ us/ˈfaɪ.ləm/
（动物分类的）门
a main division in a taxonomic (= scientific naming and organization system) relating to animals
Members of the largest and most diverse phylum of animals (Arthropoda), have segmented bodies and an external skeleton. 动物界中数量和种类最多的一个门（节肢动物门）的成员躯体分节，有外骨骼。