Meaning
The kanji 斗 (to, tō) is a fascinating character with several distinct yet interconnected meanings. At its core, 斗 represents a dipper or a ladle, a tool historically used for scooping and measuring liquids, particularly sake, or grains. Building on this, it evolved to signify a specific unit of volume within the traditional Japanese measurement system. One 斗 (itto) is equivalent to ten 升 (shō), which approximates to about 18 liters or 4.76 U.S. gallons. This unit was crucial in historical commerce, especially for rice and sake.
Beyond its use in measurement, 斗 is famously associated with the constellation Ursa Major, known in English as the Big Dipper. In Japanese, this is typically referred to as 北斗 (hokuto), literally meaning “Northern Dipper.” The constellation's visual resemblance to a dipper or ladle directly connects to the kanji's original form and meaning.
Visually, the character 斗 is a pictograph. It is believed to depict a scoop, ladle, or a measuring vessel. The top horizontal line represents the container's open mouth, while the lower strokes form its body and a handle or base. The arrangement of its four strokes clearly suggests a practical tool for handling substances. As a Grade 9 kanji, it is part of the Jōyō kanji list, meaning it's taught in secondary school rather than elementary grades.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi readings of 斗 originate from ancient Chinese pronunciations. They are primarily used when 斗 appears as part of a compound word. The two main on'yomi are ト (TO) and トウ (TŌ).
- ト (TO)
The ト (TO) reading is commonly used for meanings related to measurement units or astronomy. It often appears with a small っ (sokuon) in compound words, indicating a glottal stop or doubled consonant.
北斗 (hokuto) — The Big Dipper, Ursa Major. 北 means north, so it's the northern dipper.
一斗 (itto) — One 斗 (18 liters). This is a common way to refer to the unit of volume.
斗単位 (totan'i) — Measuring in 斗 units (e.g., in quantities of 18 liters). Though less common, it directly uses the kanji as a unit.
トウ (TŌ)
The トウ (TŌ) reading is also common. You'll find it particularly in words related to struggle or exertion, and sometimes in older or more formal compounds for measurement or drinking vessels. It’s important to distinguish this use from the kanji 闘, which also means 'fight' and shares the same on'yomi. While 斗 can imply a struggle or contest when combined with other characters, 闘 is almost exclusively used for combat.
- 斗争 (tōsō) — Struggle, conflict, contention. While often written as 闘争, 斗争 is also a valid, albeit more formal or older, form.
- 奮斗 (funtō) — Strenuous exertion, hard struggle, striving. This emphasizes putting forth great effort.
- 格斗 (kakutō) — Hand-to-hand fight, grappling. This refers to physical combat.
Kun'yomi (訓読み) — Native Japanese readings
Unlike many kanji, 斗 does not have a commonly recognized or actively used kun'yomi (native Japanese reading) in modern Japanese when it stands alone. Historically, its meaning may have been linked to native words like ひしゃく (ladle) or ます (measuring box). However, these words are typically written with different kanji (柄杓 and 升 respectively) or in hiragana today. Therefore, when you encounter 斗 by itself, you should almost always expect an on'yomi reading or understand its meaning as a component within a compound.
Common Words & Compounds
Below are several common words and compounds using the kanji 斗, organized by their thematic usage:
Units and Measurement
- 一斗缶 (ittokan) — An 18-liter can (a standard size for cooking oil, soy sauce, etc.).
- 斗量 (toryō) — Measurement using 斗 units. It can also imply an uncountable quantity, especially in negative contexts (e.g., things too numerous to measure precisely).
- 才斗 (saito) — An old unit of volume, 1/10 of a 斗.
Astronomy and Constellations
- 北斗七星 (hokutoshichisei) — The Big Dipper; Ursa Major.
- 南斗 (nanto) — The Southern Dipper (a constellation often paired with the Northern Dipper in folklore, particularly in Chinese astrology).
- 斗星 (tosei) — Any star in the Big Dipper constellation.
Struggle and Exertion
- 斗志 (tōshi) — Fighting spirit; eagerness to fight or strive.
- 奮斗努力 (funtō doryoku) — Strenuous efforts; struggling hard and making efforts.
- 苦斗 (kutō) — Hard struggle; strenuous effort.
Historical and Cultural Contexts
- 斗酒 (tōshu) — A large amount of sake (literally, "a dipper of sake").
- 枡斗 (masuto) — An old term referring to both a square wooden measuring cup (枡) and a ladle (斗), often used together.
Names
- 海斗 (Kaito) — A common male given name in Japan, often written with different kanji combinations but 海斗 is one of them.
Example Sentences
北斗七星が夜空に輝いていた。
Hokutoshichisei ga yozora ni kagayaite ita.
The Big Dipper was shining in the night sky.
この油は一斗缶で売られています。
Kono abura wa ittokan de urarete imasu.
This oil is sold in 18-liter cans.
彼は成功のために奮斗した。
Kare wa seikō no tame ni funtō shita.
He struggled hard for success.
会社は市場での激しい斗争を経験している。
Kaisha wa shijō de no hageshii tōsō o keiken shite iru.
The company is experiencing intense struggle in the market.
昔は米を斗で量っていました。
Mukashi wa kome o to de hakatte imashita.
In the past, rice was measured in 斗 units.
南斗の星々が美しく輝いていた。
Nanto no hoshiboshi ga utsukushiku kagayaite ita.
The stars of the Southern Dipper were shining beautifully.
彼らの間には激しい格斗が繰り広げられた。
Karera no aida ni wa hageshii kakutō ga kurihirogerareta.
A fierce hand-to-hand combat unfolded between them.
先生は私達に常に斗志を持つよう促した。
Sensei wa watashitachi ni tsune ni tōshi o motsu yō unagashita.
The teacher encouraged us to always have a fighting spirit.
Memory Tip
To remember the kanji 斗, visualize its original meaning: a dipper or a ladle. The character itself looks like a scoop with a handle. Imagine the top horizontal line as the scoop's rim, with the three strokes below forming the bowl and a downward-pointing handle or spout. This simple shape immediately brings to mind a tool for measuring or serving liquids or grains. Alternatively, connect it to the famous Big Dipper constellation (北斗七星). You can imagine the character as a simplified representation of that celestial dipper in the sky. This dual association—with both a physical tool and a celestial body—helps solidify its core meanings of measurement, scooping, and stars.