According to the definition in Merriam Webster below, "antiparallel" as an adjective is: parallel but oppositely directed or oriented (متوازي عكسياً/بطريقة عكسية). As in two parallel streets separated by a column of buildings, one goes to the north direction and the other to the south (طريقان متوازيان ولكن عكسيان في الإتجاه).

Therefore, "anti-parallelism" = توازٍ عكسي, "anti parallelism devices" = أجهزة توازٍ عكسي

Here's also an example from a chemical context:
If you say that electron spins are antiparallel what you actually say is "spin of one electron is antiparallel to spin of another".