Iroha Jiruishō


The Iroha Jiruishō is a 12th-century Japanese dictionary of Kanji. It was the first Heian Period dictionary to collate characters by pronunciation rather than by logographic radical or word meaning.
The Iroha Jiruishō has a complex history involving editions of two, three, and ten fascicles. The original 2-fascicle edition was compiled by an unknown editor in late Heian era circa 1144-1165 CE. This was followed by a 3-fascicle edition by Tachibana Tadakane circa 1177-1188. Finally, at the start of the Kamakura Period, another anonymous editor compiled the expanded 10-fascicle edition, entitled 伊呂波字類抄.
The main character entries are annotated with katakana to indicate both on'yomi Sino-Japanese borrowings and kun'yomi native Japanese pronunciations. The Iroha Jiruishō orthography shows that 12th-century Japanese continued to phonetically distinguish voiceless and voiced sounds, but the distinction between /zi/ and /di/, /zu/ and /du/, and /eu/ and /ou/ was being lost. These entry words typify the Japanized version of classical Chinese known as hentai Kanbun or Wakan konkōbun. This is a bilingual dictionary for looking up Chinese characters in terms of their Japanese pronunciation, and not a true Japanese language dictionary.
The Iroha jiruishō inventively groups entries by their first mora into 47 phonetic sections like i, ro, and ha ; each subdivided into 21 semantic headings shown in the table below.
HeadingRōmajiKanjiSubject
1Tenshō天象astronomical phenomena, seasons
2Chigi地儀geographical features, dwellings
3Shokubutsu植物trees, plants
4Dōbutsu動物animals
5Jinrin人倫human relations, moral questions
6Jintai人体human anatomy, body parts
7Jinji人事human affairs
8Inshoku飲食foods, drinks
9Zatsubutsu雑物miscellaneous things
10Kōsai光彩colors, brilliance
11Hōgaku方角directions, points of the compass
12Inzū員数numbers
13Jiji辞字miscellaneous 1-character words
14Jūten重点reduplicative compounds
15Jōji畳字synonym compounds
16Shosha諸社shrines
17Shoji諸寺temples
18Kokugun国郡administrative and political divisions
19Kanshoku官職official titles and ranks
20Seishi姓氏surnames, clan names
21Myōji名字names

Most of these 21 headings are self-explanatory semantic fields, with the exceptions of 13 Jiji for miscellaneous words written with a single character, 14 Jūten reduplicative compounds, and 15 Jōji synonym compounds. These 21 Iroha jiruishō headings can be compared with the 24 used two centuries earlier in the Wamyō Ruijushō.
Unlike all the other major Heian Japanese dictionaries that followed Chinese dictionary traditions, the Iroha Jiruishō's phonetic ordering can undoubtedly be interpreted, says Don C. Bailey, "as a sign of increasing independence from Chinese cultural influences." Most subsequent Japanese dictionaries, excepting kanji ones, were internally organized by pronunciation.