An Etymological Dictionary of Astronomy and Astrophysics

1. A controlled and structured list of terms or descriptors usually with a cross-reference system used in subject analysis and information retrieval in a particular field.
   

2. More generally, a work that lists words arranged and grouped according to their semantic similarities, including synonyms and sometimes antonyms. This is different from the dictionary, which
   contains definitions and pronunciations. The first major work of this kind in English is Peter Mark Roget’s Thesaurus of English words and phrases, Classified and Arranged so as to Facilitate the Expression of Ideas (1852).

Etymology (EN): From L. thesaurus “treasury, treasure,” from Gk.  thesauros  “treasure, treasury, storehouse,” from root of  tithenai “to put, to place,” → thesis.

Etymology (PE): Vâžganj, from vâž, → word, + ganj “treasure,” from Mid.Pers. ganj “treasure.”