noun
technical term; jargon; specialist terminology
Refers to words or expressions used within a specific field or profession, often difficult for outsiders to understand.
この論文には専門語が多くて、理解するのが難しい。
This paper has a lot of technical terms, so it's hard to understand.
医者が使う専門語は患
The jargon doctors use can be difficult for patients to understand.
Refers to slang or colloquial language, not necessarily tied to a profession.
Compound of 専門 (specialty, expert) + 語 (word, language).