Noun
Abbreviation of road.
Abbreviation of rad (“unit of measure”).
(knitting, firearms) Abbreviation of round.
(astronomy) Initialism of red dwarf.
(US) Initialism of restricted data.
(US, uncountable) Initialism of rural delivery, formerly used when addressing mail.
(professional title) registered dietitian
(sports) Abbreviation of right defence/defense.: The right wing player defensive position
(US, law enforcement) Initialism of reporting district..
Source: en.wiktionary.org