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

Adverb of → optical.

→ optical + -ly.

Nurâné, from nur, → light, + -âné "-ly;" nurikâné, from nurik, → optical, + -âné "-ly."

Relating to → optical activity.

→ optically; → active.

The qualifier of a medium in which the → optical depth is large, significantly larger than 1.

→ optically; → thick.

A wind with the → sonic point located at large optical depth for continuum. In particular, → Wolf-Rayet star winds are → optically thick. However, the outer parts of W-R winds are → optically thin for continuum, and in those regions the matter flow is driven by the same mechanism as in the winds of OB stars.

→ optically; → thick; → wind.

The qualifier of a medium in which the → optical depth is large, significantly smaller than 1.

→ optically; → thin.

A member of a small subset of quasars consisting of bright radio galaxies whose flux of visible light output can vary by as much as 50% in a single day.

→ optically; → violent; → variable; → quasar.