noun
prohibitory law; law banning something; negative statute
Refers to a statute or law that forbids a particular act, product, trade, etc. Often used after the thing being banned, as in 取引の禁止法, or in compounds naming specific laws.
象牙取引の禁止法が可決された。
A law banning the ivory trade was passed.
この禁止法は、公共の場
This prohibitory law bans smoking in public places.
禁令 is a ban, decree, or order of prohibition and can sound more formal or historical; 禁止法 specifically means a law or statute.
法律 is the general word for law; 禁止法 is a specific kind of law that forbids something.
A Sino-Japanese compound of 禁止, meaning prohibition or banning, and 法, meaning law. The spelling transparently reflects the legal meaning, but no further historical derivation is implied here.