| 单词 | periastron |
| 释义 | periastron —periastral, adj. /per'ee as"treuhn, -tron/, n. , pl. periastra /-treuh/. Astron. the point at which the stars of a binary system are closest (opposed to apastron). [1850-55; < PERI- + Gk ástron star; modeled on perihelion] |
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