An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A device producing cross dispersion.

→ cross; → disperser.

1) To spread or distribute from a fixed or constant source.
2) To become dispersed.

M.E., from M.Fr. disperser "scatter," from L. dispersus, p.p. of dispergere "to scatter," from → dis- "apart" + spargere "to scatter," from PIE base *(s)pregh- "to scatter;" cf. Av. spareg- "to germinate, shoot, sprout," fra-sparəγa- "shoot, sprout," Skt. parjanya- "rain, rain god," Lith. spurgas "sprout."

Pâšidan "to scatter, sprinkle," az ham pâšidan "to scatter on all sides;" cf. Gazi pâšn-/pâšnâ "to scatter, spread," Lor. perxa "sprinkling;" Av. paršat.gauu- "having a speckled cow;" Skt. prs- "to sprinkle," parsati "sprinkles;" Toch. pärs- "to sprinkle;" Lith. purškiu "I spray;" PIE roor *pers- "to spray, sprinkle."