pyramidical

As adjectives the difference between pyramidical and pyramidal

is that pyramidical is pyramidic while pyramidal is pyramid-shaped.

As a noun pyramidal is

one of the carpal bones.

As an adjective pyramidical

is pyramidic.

As a noun pyramid is

an ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in egypt or as bases for temples in mesoamerica.

As a verb pyramid is

(genetics) to combine (a series of genes) into a single genotype.

As an adjective pyramidical is

pyramidic.