Despite the predominant use of 'R' for data manipulation and various robust statistical calculations, in recent years, more people from various disciplines are beginning to use 'R' for other purposes. A critical milestone that has enabled large influx of users to the 'R' community is the development of the 'Tidyverse' family of packages and 'Rmarkdown'. With the latter, one can write all kinds of documents and produce output in formats such 'HTML' and 'PDF' very easily. In doing this seemlessly, further tools are needed for such users to easily and freely write in 'R' for all kinds of purposes. The 'r2dictionary' introduces a means for users to directly search for definitions of terms from within the 'R' environment. The source dictionary is an original work of 'The Online Plain Text English Dictionary (OPTED)'.