Source — Wiktionary, "木漏れ日" (komorebi) and "komorebi"

Title: 木漏れ日 (Japanese entry); komorebi (romanization entry)
Author: unauthored (collaborative wiki)
Publication: Wiktionary
Date: n/a (live/undated entries; consulted as of accessed date below)
URL: https://en.wiktionary.org/wiki/木漏れ日 (kanji entry); https://en.wiktionary.org/wiki/komorebi (romanization entry)
Type: tertiary / reference dictionary, neutral
Accessed: 2026-08-30

Extract

Gives the noun's etymology as a compound: 木 (ko, "tree") + 漏れ (more, "leaking, coming through") + 日 (hi, "sun(light)") — literally "tree-leak sun(light)." The hi → bi shift is identified as rendaku (連濁), a regular Japanese compounding sound change, not an irregularity specific to this word.
Defines the headword simply as "sunlight filtering through trees," part of speech noun.
Lists variant kanji spellings: 木漏れ日, 木漏れ陽, 木洩れ日, 木洩れ陽 (and a further rare variant).
The separate romanization-only entry at /wiki/komorebi contains only a Japanese non-lemma-form / romanization entry ("Rōmaji transcription of こもれび") — there is no English-language section on that page. As of this access date, Wiktionary itself does not treat "komorebi" as an established English loanword/headword, in contrast to how it treats "hygge" (see wiktionary-hygge.md, which does carry an English-loanword etymology).

No citation trail of its own (Wiktionary entries carry no inline sourcing); treat the etymology as tertiary, consistent with a compositional kanji reading rather than a claim requiring separate primary confirmation.
Does not date the word's earliest written Japanese attestation.
A claim seen while researching this word — that a Japanese-learning site called it a "Foreign Word of the Day" on 2017-04-14 — appeared only in an automated summary of this page's content and could not be corroborated by direct reading of Wiktionary itself; it is not included as a claim of this project and should not be attributed to Wiktionary.