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Convex describes a surface that curves , like the outside of a ball, or like the front of the eye. If you laid a straight stick across it, the middle of the surface would push the stick up.
Convex Convex（凸的） describes a surface that curves outwards用來形容表面向外凸出， like the outside of a ball, or like the front of the eye像球的外側，或眼睛前面那樣。 If you laid a straight stick across it如果你把一根直棍橫放在上面， the middle of the surface would push the stick up表面的中間會把棍子頂起來。
The opposite word is : that curves , like a bowl.
The opposite word is concave相反的字是concave（凹的）： that curves inwards, like a bowl是向內凹的，像碗一樣。
Glasses, mirrors, and lenses can be convex; a convex lens is thicker in the middle and can make things look bigger. In maths, a convex shape has no dents — a rubber band stretched around it would lie against the whole outline.
Glasses, mirrors, and lenses can be convex眼鏡、鏡子、鏡片都可以是convex的； a convex lens is thicker in the middleconvex lens（凸透鏡）中間比較厚， and can make things look bigger可以讓東西看起來變大。 In maths在數學裡， a convex shape has no dentsconvex的形狀沒有凹陷—— a rubber band stretched around it would lie against the whole outline用一條橡皮筋繞著它拉緊，會貼著整個輪廓。
It is a school-science word more than an everyday one. In casual talk people just say curved out, or bulging.
It is a school-science word more than an everyday one這比較是學校自然課的用字，不是日常用語。 In casual talk people just say日常說話大家就直接說 curved out, or bulgingcurved out（向外彎）或bulging（凸起）。
You will also meet it as a noun for that kind of shape, but the word you need first is the adjective.
You will also meet it as a noun for that kind of shape你也會看到它當名詞用，指這種形狀， but the word you need first is the adjective但你最先需要學的是形容詞這個用法。
組成From Latin convexus, “arched, vaulted,” through French convexe. The English word does not split into smaller English pieces.
同家族的字
- convexitythe noun: the quality of being convex
原始詞典資料10 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。
convexadj/ˈkɒn.vɛks/
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Curved or bowed outward like the outside of a bowl, circle, or sphere.
- [D]rops of water naturally form themselves into figures with a convex surface; […]
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having an epigraph that is a convex set.
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geometrymathematicsscienceshaving no internal angles greater than 180 degrees.
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mathematicssciencesarranged such that for any two points in the set, a straight line between the two points is contained within the set.
convexnoun/ˈkɒn.vɛks/
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Any convex body or surface.
- Half heaven's convex glitters with the flame.
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gamblinggamesA playing card made convex for use in cheating.
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gamblinggamesA small convex mirror used to cheat by observing other players' cards.
- Of all the devices for defrauding at poker, the “shiner,” or “convex” […] Modern convexes are also considerably larger than those of former days.
convexverb/ˈkɒn.vɛks/
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To form a convex curve or surface; to become convex.
- In like manner the north pier will convex seaward, extending across the bay to the extent of 1000 feet from low water, terminating in about eight fathoms, leaving a clear entrance of 500 feet between the pier heads, the depth of the entrance being from seven to eight fathoms.
- If the valve is ground excessively, the surfaces of the valve and cage will convex so that the sealing contact is poor.
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To cause to form a convex curve or surface; to make convex.
- The back edge of the saw being under the lip of the cleat, use the anvil for a fulcrum and press down on the edge of the saw opposite, which will convex the plate, as the springing up concaved it, and the action of the fast and loose will be the reverse; that is, the fast will go down and the loose come up.
- This will convex the fan and hold the cards more rigidly in place.
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To circulate or cause to circulate in a curved path; to cause or exhibit convection.
- The crystal/melt interface thus convexes into the melt; however, the convexity of the interface ( Figure 53 ) is not as strong as it is when the crucible does not rotate (Figure 52).
- The lid on will convex the heat and you'll need that after it's been chilled.
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。