Words or expressions used in a particular field of study, profession, or industry — technical terms or jargon that may be hard for outsiders to understand.
医師は専門用語を使いすぎて患者に説明するのが下手だと言われることがある。
Doctors are sometimes said to be poor at explaining things because they use too much technical jargon.
論文を読むときは、分からない専門用語を辞書で調べる習慣をつけるといい。
When reading papers, it's good to get into the habit of looking up technical terms you don't understand in a dictionary.
このマニュアルは初心者向けに専門用語をなるべく平易な言葉で説明している。
This manual explains technical terms in as simple language as possible for beginners.