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A pergola (note the correct spelling) is a structure that has a horizontal part made of crossed strips with space in between for supporting vines or other plants. The horizontal part is supported by posts.
Pergola is a term of Italian origin meaning recessive heave. The original Italian pronunciation is Pe'rgola with the accent falling on the vowel "e", but in English is commonly pronounced Pergo'la with the accent on the vowel "o".