also: ぶくき
古文書には服忌に関する規定が記されている。
Ancient documents contain regulations concerning mourning.
Standard kanji form for this rare term.
Alternate reading ぶくき is rare and may be encountered in older texts.
The term 服忌 is composed of 服 (clothing, here referring to mourning attire) and 忌 (mourning, abstinence). The exact historical derivation is uncertain, but it is a traditional compound used in formal mourning contexts.