Is struchtur ailtireachta ar bhun triantanach , ceamach no polagonach , le taobhanna triantanacha a dtagann a dtaobhanna le cheile ag pointe buaice, is ea pirimid . ^[1]

San ailtireacht Eigipteach, is seadchomhartha tuamuil an phirimid ar bhun ceamach. Is iad na pirimidi is cailiula pirimidi an 4u riora ar ardchlar Giza gar do Chaireo na h Eigipte . Ta Pirimid Mhor Cheaps (c 2589-66 RC) 146 rn ar airde, ar bhun ceamach le taobhanna 230 m, togtha le 2.5 milliun bloc aolchloich e, gach ceann 2.5 tonna meachain . ^[2]

San ailtireacht reamhCholomach i Meiricea Theas , is cnoc saorga le barr cothrom i.

Feach freisin [ cuir in eagar | athraigh foinse ]

• Pirimidi na hEigipte

Tagairti [ cuir in eagar | athraigh foinse ]

Is siol e an t-alt seo. Cuir leis , chun cuidiu leis an Vicipeid . Ma ta alt nios forbartha le fail i dteanga eile, is feidir leat aistriuchan Gaeilge a dheanamh.