noun
spermicide; spermatocide
Medical and pharmaceutical term for a substance that kills sperm, used in contraception.
殺精子剤は避妊の一つの方法として使われる。
Spermicide is used as one method of contraception.
避妊薬 is a broader term for contraceptive drugs, while 殺精子剤 specifically refers to agents that kill sperm.
Compound of 殺 (satsu, 'kill'), 精子 (seishi, 'sperm'), and 剤 (zai, 'agent, medicine').