Question

Which reference aid is best for researching a word's origins?synonym finder textbook glossary thesaurus dictionary?

Answer 1

I would say most likely a dictionary

Answer 2

A dictionary is best for researching a word's origins. The last option is correct.

A dictionary is a book or electronic resource which function is to list the words of a language (typically in alphabetical order) and to provide their meaning, or gives the equivalent words in another language, often also adding information about pronunciation, origin, and usage. Online, there are a wide range of dictionaries to choose as well.