A Syriacist or Syrianist is a specialist in Syriac language

Syriac language

Syriac is a dialect of Middle Aramaic that was once spoken across much of the Fertile Crescent. Having first appeared as a script in the 1st century AD after being spoken as an unwritten language for five centuries, Classical Syriac became a major literary language throughout the Middle East from...

 and Christianity

Syriac Christianity

Syriac or Syrian Christianity , the Syriac-speaking Christians of Mesopotamia, comprises multiple Christian traditions of Eastern Christianity. With a history going back to the 1st Century AD, in modern times it is represented by denominations primarily in the Middle East and in Kerala, India....

. Specifically, British, French, and German scholars of the 18th and 19th centuries who were involved in the study of Syriac/Aramaic language and literature were commonly known by this designation, at a time when Hebrew was little understood outside Assyrian/Syriac communities.