Synonyms for pentagonal

Grammar : Adj

Spell : pen-tuh-gon, -guh n

Phonetic Transcription : ˈpɛn təˌgɒn, -gən

Définition of pentagonal

Origin : plane figure with five angles and five sides, 1560s, from Middle French pentagone or directly from Late Latin pentagonum "pentagon," from Greek pentagonon, noun use of neuter of adjective pentagonos "five-angled," from pente "five" (see five) + gonia "angle" (see knee (n.)). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945. Related: Pentagonal.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]

As in five : adj having five of something

Example sentences :

Most of the prisms are pentagonal, though some are of four or six sides.
Extract from : « The Book of the National Parks » by Robert Sterling Yard

Each ray was pentagonal in shape, and had three towers on its exterior angles.
Extract from : « Westminster » by Sir Walter Besant

Shell with fifty-two sutures and fifty-two sutural meshes; with four hexagonal and sixteen pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

The four meshes of each equatorial and each polar plate of equal size, pentagonal, about eight times as broad as the bars.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Shell with fifty-four sutures and fifty-four very small sutural meshes, with eight hexagonal and twelve pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Shell with fifty-two sutures and fifty-two sutural meshes, with four hexagonal and sixteen pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Shell with fifty-two sutures and fifty-two sutural pores, with four hexagonal and sixteen pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Shell with fifty-four sutures and fifty-four sutural meshes, with eight hexagonal and twelve pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Shell with fifty-four sutures and fifty-four circular sutural pores: with eight hexagonal and twelve pentagonal plates.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) » by Ernst Haeckel

Therefore the two opposite meshes are larger and pentagonal, the other two meshes (alternating with these) are smaller and square.
Extract from : « Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index » by Ernst Haeckel

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