pyramid

1 of 2

noun

pyr·​a·​mid ˈpir-ə-ˌmid 

1

a

: an ancient massive structure found especially in Egypt having typically a square ground plan, outside walls in the form of four triangles that meet in a point at the top, and inner sepulchral chambers

b

: a structure or object of similar form

2

: a polyhedron having for its base a polygon and for faces triangles with a common vertex see Volume Formulas Table

3

: a crystalline form each face of which intersects the vertical axis and either two lateral axes or in the tetragonal system one lateral axis

4

: an anatomical structure resembling a pyramid: such as

a

: any of the conical masses that project from the renal medulla into the renal pelvis

b

: either of two large bundles of motor fibers from the cerebral cortex that reach the medulla oblongata and are continuous with the pyramidal tracts of the spinal cord

5

: an immaterial structure built on a broad supporting base and narrowing gradually to an apex

the socioeconomic pyramid

pyramidal

pə-ˈra-mə-dᵊl  ˌpir-ə-ˈmi- 

adjective

pyramidally adverb

pyramidical

ˌpir-ə-ˈmi-di-kəl 

adjective

Illustration of pyramid

• pyramid 2

pyramid

2 of 2

verb

pyramided; pyramiding; pyramids

intransitive verb

1

: to speculate (as on a security or commodity exchange) by using paper profits as margin for additional transactions

2

: to increase rapidly and progressively step by step on a broad base

transitive verb

1

: to arrange or build up as if on the base of a pyramid

2

: to use (something, such as profits) in speculative pyramiding

3

: to increase the impact of (something, such as a tax assessed at the production level) on the ultimate consumer by treating as a cost subject to markup

Examples of pyramid in a Sentence

Noun

the ancient pyramids of Egypt

Recent Examples on the Web

Noun

Inomata and his colleagues also believe that the site would have been built by willing participants, not compulsory labor used to construct many ancient wonders such as Egypt’s pyramids and later Maya cities. —Katie Hunt, CNN Money, 5 Nov. 2025

The futuristic glass pyramids and stark white domes appear in stark contrast to the rugged Sonoran desert landscape and Catalina Mountains rising in the distance. —Shaun McKinnon, AZCentral.com, 4 Nov. 2025

So far, the team has successfully knitted small objects shaped like a C and a pyramid, showing that the machine can handle curves, layers, and overhangs with ease. —Aamir Khollam, Interesting Engineering, 4 Nov. 2025

From the central atrium, the Grand Staircase -- a six-story ascent lined with around 60 monumental artifacts including statues, sarcophagi, columns and stelae -- culminates in a view of Giza's three famous pyramids. —Ayat Al-Tawy, ABC News, 2 Nov. 2025

Word History

Etymology

Noun

Latin pyramid-, pyramis, from Greek

First Known Use

Noun

1549, in the meaning defined at sense 1a

Verb

circa 1900, in the meaning defined at intransitive sense 1

Phrases Containing pyramid

• food pyramid
• pyramid scheme
• renal pyramid

Kids Definition

pyramid

1 of 2 noun

pyr·​a·​mid ˈpir-ə-ˌmid 

1

: a massive structure built especially in ancient Egypt that usually has a square base and four triangular sides meeting at a point

2

: something that resembles a pyramid in shape or organization

the social pyramid

3

: a polyhedron that has a polygon for its base and triangles that meet at a point at the top for its sides

pyramidal

pə-ˈram-əd-ᵊl  ˌpir-ə-ˈmid- 

adjective

pyramid

2 of 2 verb

: to build up in the form of a pyramid

Medical Definition

pyramid

noun

pyr·​a·​mid ˈpir-ə-ˌmid 

1

: a polyhedron having for its base a polygon and for faces triangles with a common vertex

2

: an anatomical structure resembling a pyramid: as

a

: renal pyramid

b

: either of two large bundles of motor fibers from the cerebral cortex that reach the medulla oblongata and are continuous with the corticospinal tracts of the spinal cord

c

: a conical projection making up the central part of the inferior vermis of the cerebellum

Legal Definition

pyramid

1 of 3 noun

pyr·​a·​mid ˈpir-ə-ˌmid 

1

: a group of holding companies superimposed on one another to give those in control of the top holding company control over all of the companies with a small investment

2

: the series of operations involved in pyramiding on an exchange

3

: a pyramid scheme

pyramid

2 of 3 intransitive verb

: to speculate (as on a security or commodity exchange) by using paper profits as a margin for additional transactions

transitive verb

1

: to use (as profits) in speculative pyramiding

2

: to increase the impact of (as a tax assessed at the production level) on the ultimate consumer by treating as a cost subject to markup

pyramid

3 of 3 adjective

: of, relating to, or being an illegal scheme in which participants give money or other valuables in exchange for the opportunity to receive payment for recruiting others to participate in the scheme