a large marine arthropod, Limulus polyphemus, of shallow coastal waters of eastern North America and eastern Asia, having both compound and simple eyes, book gills, a stiff tail, and a brown carapace curved like a horseshoe: a living fossil related to the woodlouse.
any marine chelicerate arthropod of the genus Limulus, of North America and Asia, having a rounded heavily armoured body with a long pointed tail: class Merostomata Also called king crab
- Horseshoe fern
noun 1. another name for para3
- Horseshoe fistula
horseshoe fistula horse·shoe fistula (hôrs’shōō’, hôrsh’-) n. An anal fistula partially encircling the anus and opening at both ends on the cutaneous surface.
- Horseshoe kidney
horseshoe kidney n. The union of the lower, or occasionally the upper, extremities of the kidneys by a tissue band extending across the vertebral column.
noun 1. a horseshoe-shaped permanent magnet.