Japanese edit

For pronunciation and definitions of しゅいん – see the following entries.
手淫
[noun] (dated) a hand job
[noun] (rare, dated) fingering (sexual act)
[noun] (dated) masturbation
[verb] (dated) to give a hand job
[verb] (rare, dated) to finger (to penetrate and sexually stimulate with one's finger)
[verb] (dated) to masturbate
主因
[noun] primary cause; main factor
朱印
[noun] crimson stamp
[noun] A seal stamp given to worshippers and visitors to Shinto shrines and Buddhist temples in Japan. The seal stamps are often collected in books called shuinchō (朱印帳) that are sold at shrines and temples.
(This term, しゅいん, is the hiragana spelling of the above terms.)

(The following entry is uncreated: 手印.)