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Pentagonal means shaped like a pentagon, or having five sides and five angles. You use it of a real object: a pentagonal table, a pentagonal courtyard, a pentagonal coin. It is the adjective that belongs with pentagon. In ordinary speech you would not usually call the shape itself 'a pentagonal' — you would call it a pentagon.
五邊形的；五角的
組成pentagon + -al (of / like).
同家族的字
- pentagonthe five-sided shape this adjective describes
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
pentagonaladj/pɛnˈtæɡənəl/
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Of, relating to, or shaped like a pentagon.
- If the base be a triangle, it is called a triangular prism; if a square, a square prism; if a pentagon, a pentagonal prism; and' if the base is any irregular figure, it is called an irregular prism : ...
- Seed micromorphology:—Seed coat is laticostate. Epidermal cells are elliptical to irregularly pentagonal. Cell walls are thickened mostly at the corners, the boundaries are raised […]
pentagonalnoun/pɛnˈtæɡənəl/
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Something having the shape of a pentagon.
- Speaking of protection, note that not only are the end pentagonals surrounded by a generous air space, but the entire instrument is insulated, […]
- The pentagonals with the flowers and the leaves of the central calyx are gilded all over, as is the inner lip of the vessel.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。