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quinquelateral
quinquelateral adj. and n. 
/ˌkwɪŋkwᵻˈlat(ə)rl̩/, /ˌkwɪŋkwəˈlætrəl/ (a) adj. having five sides; (also) involving five groups or parties; (b) n. a five-sided plane figure.
Brit. /ˌkwɪŋkwᵻˈlat(ə)rəl/
, /ˌkwɪŋkwᵻˈlat(ə)rəl//ˌkwɪŋkwᵻˈlat(ə)rl̩/U.S. /ˌkwɪŋkwəˈlædərəl/
, /ˌkwɪŋkwəˈlædərəl//ˌkwɪŋkwəˈlætrəl/ΚΠ
1705 R. Fleming Christol. I. 12 It was a Place built with Quinque-lateral Porches or Piazza's like Cloyster-walks.
1856–8 W. Clark tr. J. van der Hoeven Handbk. Zool. I. 157 Body cylindrical or quinquelateral.
1895 Philos. Trans. 1894 (Royal Soc.) A. 185 60 The number of lines on the surface which intersect..both the end lines and no others of an open..quinquilateral is 1.
1938 Harvard Jrnl. Asiatic Stud. 3 99 Twelve segments are irregular quadrilaterals, two are quinquelaterals.
1961 tr. N. Krushchev in N. H. Mager & J. Katel Conquest without War vi. 140 Neither a bilateral nor even a quinquelateral treaty can save any rotten throne from its own people.
1980 Internat. Polit. Sci. Rev. 1 518 (caption) A ‘Quinquelateral’ World Image-Plan.
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