An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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silhouette disk
  گرده‌ی ِ سیه‌رخ، دیسک ِ ~  
gerde-ye siyah-rox, disk-e ~
Fr.: disque silhouette  

A dark disk seen in absorption against the bright nebular background. → proplyd.

Etymology (EN): From Fr. silhouette, in allusion to Étienne de Silhouette (1709-67), Fr. controller general of finances in 1759; perhaps from his ephemeral tenure; → disk.

Etymology (PE): Gerdé, → disk; siyah-rox, from siyah, → black, + rox, variant of
ru(y) “face, surface; aspect; appearance,” (Mid.Pers. rôy, rôdh “face;” Av. raoδa- “growth,” in plural form “appearance,” from raod- “to grow, sprout, shoot;” cf. Skt. róha- “rising, height”).