n. In anatomy, a vascular network; a plexus, glomerulus, or congeries of small vessels: in botany, a structure like network.n. In certain astrolabes, a movable skeleton framework cut out of a circular sheet of metal, and lying between the planisphere and the diopter or alidade. It carries one or two pointers, also an eccentric ring marked with the signs of the zodiac, and several curved arms indicating the place of the pole of the ecliptic and of certain stars.