Refers to the person who buys something, often in contrast with the seller (売り主). Used in both everyday and commercial contexts.
買い主が見つからなければ、その家は売れ残るだろう。
If a buyer isn't found, the house will likely remain unsold.
売り主と買い主の間で価格交渉が行われた。
Price negotiations took place between the seller and the buyer.
Standard kanji spelling; the okurigana い makes the reading clear.
Abbreviated kanji form without okurigana; less common but still used in some contexts.
Compound of 買い (kai, 'buying', the continuative form of 買う) and 主 (nushi, 'owner' or 'master'). Literally 'buying master'.