栃

栃 (Kangxi radical 75, 木+5, 9 strokes, cangjie input 木竹一尸 (DHMS), composition ⿰木⿸𠂆万 or ⿰木厉)

1. horse chestnut
2. stable

• Kangxi Dictionary: not present, would follow page 521, character 12
• Dai Kanwa Jiten: character 14687
• Hanyu Da Zidian (first edition): not present, would follow volume 2, page 1185, character 4
• Unihan data for U+6803

Orthographic borrowing from Japanese 栃 (tochi).

Spelling pronunciation, as 勵／励 (lì) or 蠣／蛎 (lì).

栃

1. only used in 栃木 (Lìmù)

• 杤, 櫔

A 国字 (kokuji, “Japanese-coined character”). According to Kanjigen, an ideogrammic compound (會意 / 会意), superficially of 木 +‎ 万 or 厉. According to Kōdansha's Shindaijiten, unknown, but raises a theory that it derives from a hypothetically earlier 櫔 (simplyifying 萬 → 万).

Speculative theory found elsewhere suggests a derivation from 栃木(とちぎ) (tochigi, “Tochigi”), the toponym with which the character is primarily associated: 十 (to, “ten”) +‎ 千 (chi, “thousand”) is a yamato kotoba formulation of the number 10,000, also written as 万 or 萬, whilst 木 is read as ki or gi, thus suggesting that the earlier form of the character be precisely an ideogrammic compound (會意 / 会意): 木 + 萬, superficially aligning with Kanjigen; however, the veracity of this is undetermined.

Additionally, assuming an origin in terms of 木 +‎ 萬, the addition of the upper 𠂆 could be explained as an assimilation towards the similar characters 勵 and 蠣 (see spelling pronunciation below).

This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

(Fourth grade kyōiku kanji)

1. Japanese horse chestnut (Aesculus turbinata)
2. short for 栃木

• Kan’yō-on: れい (rei)
• Kun: とち (tochi, 栃, Jōyō ^†)

• 橡

Spelling pronunciation, guided by characters like 励(れい) (rei) and 蛎(れい) (rei). As a kokuji designed for the native word とち (tochi), 栃 originally does not have an on'yomi.

• IPA^(key): [ɾe̞ː]

栃(れい) • (rei) ^{←れい (rei)?}

1. short for 栃木 (Tochigi, “Tochigi (a prefecture of Japan)”)

• Tōdō, Akiyasu, Matsumoto, Akira, Takeda, Akira, Kanō, Yoshimitsu, editors (2018), 漢字源 [Kanjigen] (in Japanese), Revised sixth edition, Gakken, →ISBN
• GlyphWiki
• 増殖難読漢字辞典
• 県民の日・とちぎの由来

栃 • (hoe) (hangeul 회, revised hoe, McCune–Reischauer hoe, Yale hoy)

1. type of oak
2. stable