pyrgoïdal

See also: pyrgoidal

French

Etymology

From Ancient Greek πύργος (púrgos, “tower”) +‎ -oïde +‎ -al.

Adjective

pyrgoïdal (feminine pyrgoïdale, masculine plural pyrgoïdaux, feminine plural pyrgoïdales)

1. (obsolete) In mathematics, qualifies a number that is composed of a columnar number and a pyramidal one, such that the side of the first is larger than that of the second by one