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Wordswarms From Years Past


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Adjacent Words

Pyralidae
Pyralididae
Pyralis
Pyrallolite
Pyrameis Atalanta
Pyramid
pyramid bugle
Pyramid Lake
pyramid plant
pyramid scheme
pyramid selling
Pyramidal
pyramidal bone
pyramidal motor system
pyramidal tent
pyramidal tract
pyramidally
Pyramides
Pyramidia
pyramidic
Pyramidical
Pyramidically
pyramiding
Pyramidion
Pyramidoid
pyramidologist
pyramidology
pyramids
Pyramids of Egypt

Pyramidal numbers definitions

Webster's 1913 Dictionary

2. (Crystallog.) Same as Tetragonal. Pyramidal numbers (Math.), certain series of figurate numbers expressing the number of balls or points that may be arranged in the form of pyramids. Thus 1, 4, 10, 20, 35, etc., are triangular pyramidal numbers; and 1, 5, 14, 30, 55, etc., are square pyramidal numbers.



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