evolute

Adjective

(malacology) Having or being a (mollusc) spiral shell in which the whorls touch along a surface.

Japanese Meaning

巻貝学において、巻貝の螺旋状の殻が、各階層が表面で触れ合っている形状を指す。

In the museum display, the collector admired the tiny evolute shell, its exposed whorls forming a delicate spiral.

博物館の展示で、収集家は周巻が表面で互いに接している外巻きの小さな貝殻の繊細な螺旋に見とれた。

Sense（1）

(malacology) Having or being a (mollusc) spiral shell in which the whorls touch along a surface.