1. Angulate definition: having angles or an angular shape synonyms: angular, three-cornered, cuspated, cuspidal, square-shaped, unicuspid, tricuspid, equiangular

2. The Chambered nautilus, Nautilus pompilius, also called the pearly nautilus, is the best-known species of nautilus.The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral.The shell exhibits countershading, being light on the bottom and dark on top.This is to help avoid predators, because when seen from