Rare spelling of 抗原 (“antigen”).

(uncommon) a commoner, an ordinary person (in contrast to the aristocracy or nobility)

(informal) ex-girlfriend

(informal) ex-boyfriend

causing further loss when already failing to bring any benefit; backfiring

a surname

(host industry) Short for 元担当 (moto-tantō).

Used other than figuratively or idiomatically: see 一 and 本 (one thing) / Short for 一本勝ち (ippon-gachi, “winning in one blow”).

a comic book, a cartoon book

hardcore pornography; 'underground' pornography showing uncensored genitals. Technically illegal in Japan.