As a handy reference, the Unicode Consortium here provides a search interface to the Unicode Hàn (漢) Database (Unihan).
The Unihan Database organizes information relating to the properties of CJK Unified Ideographs. Unihan Database Documentation is available in UAX #38.
For production reasons, the version of the Unihan database available via this lookup tool may not yet be in sync with the latest version of the Unicode Standard. For access to the most recent version of the raw data files (Unihan.zip), see http://www.unicode.org/Public/UCD/latest/.
the “readings” portion of the db has some surprisingly interesting data. basically it’s a short concise dictionary for Cantonese, Mandarin, Japanese, Vietnamese and Korean characters. there are over 23,000 definitions (in total).
here’s a sample from that database:
谷
U+8C37 kDefinition valley, gorge, ravine U+8C37 kHangul 곡 U+8C37 kHanyuPinlu gǔ(145) U+8C37 kHanyuPinyin 63902.010:gǔ,lù,yù U+8C37 kJapaneseKun TANI KIWAMARU U+8C37 kJapaneseOn KOKU YOKU U+8C37 kKorean KOK YOK U+8C37 kMandarin gǔ U+8C37 kTang *guk iok U+8C37 kVietnamese cốc U+8C37 kXHC1983 0399.040:gǔ 1415.170:yù
available free for down here:
http://www.unicode.org/reports/tr38/
direct link to version 9:
http://www.unicode.org/Public/9.0.0/ucd/Unihan.zip
direct link to version 10:
http://www.unicode.org/Public/10.0.0/ucd/Unihan-10.0.0d2.zip
links to other downloadable resources:
http://www.unicode.org/Public/