RDの定義と意味 - メリアム・ウェブスター

RD Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition abbreviation (1) abbreviation (2) abbreviation (3) symbol abbreviation 4 abbreviation (1) abbreviation (2) abbreviation (3) symbol Entries Near Cite this Entry Citation Kids Definition Kids Medical Definition Medical Show more Show more Citation Kids Medical Save Word To save this word, you'll need to log in. Log In R & D 1 of 4 abbreviation (1) research and development rd 2 of 4 abbreviation (2) 1 road 2 rod 3 round RD 3 of 4 abbreviation (3) 1 registered dietitian 2 rural delivery -rd 4 of 4 symbol — used after the figure 3 to indicate the ordinal number third 3 rd 83 rd Browse Nearby Words rcvr R & D rd See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “R & D.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/R%20%26%20D. Accessed 1 May. 2026. Copy Citation Kids Definition -rd symbol — used after the figure 3 to indicate the ordinal number third 3 rd 63 rd Medical Definition rd 1 of 2 abbreviation rutherford RD 2 of 2 abbreviation 1 reaction of degeneration 2 registered dietitian Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Word of the Day Beltane See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More More Commonly Mispronounced Words 5 Verbal Slip Ups and Language Mistakes Is that lie 'bald-faced' or 'bold-faced'? The Difference Between 'i.e.' and 'e.g.' Why is '-ed' sometimes pronounced at the end of a word? See More Popular in Wordplay See More The Longest Long Words List 9 Other Words for Beautiful Was 'nervous Nellie' a Real Person? 12 Lovely and Unusual Words for the Natural World Why do we 'bury the lede?' See More Popular See More More Commonly Mispronounced Words The Longest Long Words List 9 Other Words for Beautiful See More Games & Quizzes See All Quordle Can you solve 4 words at once? Play Blossom Pick the best words! Play The Missing Letter A daily crossword with a twist Play Name That Tree! A quiz that’s all bark, no bite. Take the quiz See All