noun
involute curve
A mathematical curve traced by a point on a taut string unwinding from another curve. Used in geometry and gear design.
インボリュート曲線は歯車の歯形に応用される。
Involute curves are applied to gear tooth profiles.
From English 'involute' + 曲線 (curve). The term 'involute' comes from Latin 'involutus', past participle of 'involvere' (to roll in or wrap).