n. In architecture, a pilaster, especially a pilaster in certain positions, as one of a pair on either side of a doorway, or one standing opposite a pillar; specifically, the pilaster used in Greek and Roman architecture to terminate one of the side walls of a building when these are prolonged beyond the face of the end wall.n. The native Brazilian name of the common or American tapir, Tapirus americanus.n. A name in northwestern South America of the ivory-nut palm, Phytelephas macrocarpa. See Phytelephas.