DICTIONARY · CC-CEDICT

凸凸

Mandarin · pinyin tū tū

convex on both sides (of lens)
biconvex

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Characters in this entry

凸: tū · protrude, bulge out, convex

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Mandarin tones

1–1 · tu1 tu1

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Follow a written form into the eight pinned witnesses: Analects, Mencius, Laozi, Zhuangzi, Xunzi, Han Feizi, Sunzi and the Mao Shijing. A match is a place to investigate; it does not prove that a modern dictionary sense fits the passage.

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