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凸 — pronunciations, definitions, and tags
Hanzi
Pinyin
English
Tags
凸
tū
convex
HSK 7, v, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
to stick out
HSK 7, v, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
Taiwan pr. [tú]
HSK 7, v, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
to protrude, to bulge out; convex
HSK 7, v, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
protruding
HSK 7, unknown, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
male (connector etc)
HSK 7, unknown, 5 strokes, radical 凵, rank #19129, Very Hard
凸
tū
Taiwan pr. [tu2]
HSK 7, unknown, 5 strokes, radical 凵, rank #19129, Very Hard
tū(tu1)tu T1
1convex
2to stick out
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March 24, 2026
凸tū(tu1)
The character 凸 (tū) primarily describes the shape or quality of being convex or protruding. It is commonly used in contexts such as geometry, describing objects that bulge outward, and can also refer to things that are noticeably sticking out, like a bump or a bulge.
Strokes5Radical凵Frequency#19129DifficultyVery Hard
Cultural note
In Taiwan, the pronunciation of 凸 as tú can also refer to protruding features in a playful or colloquial manner, often used in casual conversations about fashion or design.
Memory tip
Imagine a 'tub' (tū) that is round and bulging outwards at the sides. The character 凸 resembles a 'tub' with its outward curves, helping you remember both its shape and pronunciation.
Meanings of 凸
tū(tu1)
1convex
2to stick out
Exercise 1 of 2
By ear
Play it, then pick what 凸 means.
About 凸
凸Simplified
5Strokes
凵Radical
形容词xíngróngcíadjective (adj.)Part of Speech
#19129Frequency Rank
HSK 3.0L7AdvancedCEFRC2
Podcast: 凸
Podcast: 凸
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AI study notes for 凸
Quick Contrast
凹 (āo) - use 凸 for convex shapes, while 凹 describes concave shapes.
Usage Notes
Learners often confuse 凸 with its antonym 凹 (āo), which means concave. This character is more informal and typically used in everyday conversation or descriptions rather than formal writing. Be cautious with the tone; using the wrong tone can change the meaning entirely.
HSK Study Tips
While 凸 is not in the official HSK vocabulary, it connects to other words describing shapes, such as 平 (píng) for flat and 凹 (āo) for concave. Focus on understanding its use in context, especially in discussions about shapes or physical objects.
Common Mistakes
Learners sometimes confuse 凸 with other similar-looking characters, leading to mispronunciations like using 'dū' instead of 'tū'. Remember that the correct pronunciation is critical for conveying the right meaning.
AI-enhanced 2026-03-24
Pronunciation of 凸
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Learning Lab
Knowing 凸 is seven skills, not one.
Its meaning, its character, its pinyin, its tone — hearing it, saying it, writing it. The Learning Lab measures each one from your own practice, on every word you study, so you see what you actually know rather than how much you have done.
The character 凸 (tū) primarily describes the shape or quality of being convex or protruding. It is commonly used in contexts such as geometry, describing objects that bulge outward, and can also refer to things that are noticeably sticking out, like a bump or a bulge.
When to use 凸
Learners often confuse 凸 with its antonym 凹 (āo), which means concave. This character is more informal and typically used in everyday conversation or descriptions rather than formal writing. Be cautious with the tone; using the wrong tone can change the meaning entirely.
凸 or something close to it
凹 (āo) - use 凸 for convex shapes, while 凹 describes concave shapes.
What learners get wrong
Learners sometimes confuse 凸 with other similar-looking characters, leading to mispronunciations like using 'dū' instead of 'tū'. Remember that the correct pronunciation is critical for conveying the right meaning.
Write 凸
凸
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Practice writing 凸 stroke by stroke. Watch the animation to learn the stroke order, then try writing it yourself.
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Grammar patterns of 凸
凸 functions as a verb — the action or state of the sentence. The Chinese order is Subject + Verb + Object (我吃饭). Negate it with 不 (habitual / future) or 没(有) (completed action). Add aspect markers like 了, 过, 着 directly after the verb. It carries 7 related meanings, each with its own usage notes below. The example sentences below show it in action, with practice buttons (Listen, Practice Writing, Practice Speaking) on every line.
Exercise 1 of 4
Fill the gap
Type the missing word. Pinyin works; then pick the character.
他摇摇晃晃地行走在停车场凹____不平的地面上。
He staggered on the uneven surface of the car park.
Example sentences for 凸 (10)
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1
他摇摇晃晃地行走在停车场凹凸不平的地面上。
tā yáo yáohuàng huǎng dì xíngzǒu zài tíngchēchǎng āotū bùpíng de dìmiàn shàng。
He staggered on the uneven surface of the car park.
