Why is Semitic defined as;
a group of languages — including Hebrew and Arabic — as well as the people who traditionally speak them. Semitic is rooted in the Biblical name Shem, the son of Noah, who is traditionally thought of as the direct ancestor of the Jews and Arabs.
And yet Antisemitic is defined as;
Characterized by prejudice, hostility, or discrimination towards Jewish people on religious, cultural, or ethnic grounds; anti-Jewish.
Why or when were Arabs dropped from the term?
No particular reason for wanting to know and it doesn’t change the debate here at all, as we understand what is implied by the term.
Just curious.