| 单词 | sigmaspire |
| 释义 | > as lemmasˈsigmaspire ˈsigmaspire n. (see quot. 1887). ΚΠ 1887 Encycl. Brit. XXII. 417/2 (Sponges) One of the simplest forms [of microscleres] is the sigmaspire..; it looks like the letter C or S, according to the direction in which it is viewed, its actual form being that of a single turn of a cylindrical spiral. < as lemmas |
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