noun
Refers to excessive spending, indulgence, or luxury. Often used in compounds such as 贅沢 (ぜいたく).
彼の生活は贅の限りを尽くしている。
His lifestyle is the height of luxury.
贅沢 is the common word for 'luxury' or 'extravagance'; 贅 alone is a bound form mainly used in compounds or literary contexts.
The kanji 贅 is of Chinese origin, meaning 'extravagant' or 'superfluous'. The Japanese reading ぜい is the on'yomi. The exact historical derivation is uncertain.