quadrivium
four
【医】 quadri-; Quat; quattuor; tetra-
class; door; gate; gateway; ostium; phylum; school
【计】 gate
【医】 binary division; hili; hilum; hilus; phylum; pore; Pori; porta; portae
portal; porus; pyla
【经】 portal
course; science; study; subject
【法】 science