Last Updated:2025/11/24
(astronomy) Initialism of red dwarf. / (US) Initialism of restricted data. / (US, uncountable) Initialism of rural delivery, formerly used when addressing mail.
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RD
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Source Word
RD
Noun
abbreviation
alt-of
countable
initialism
uncountable
US
Japanese Meaning
赤色矮星(赤色小型星:astronomyにおけるred dwarfの意味) / 制限データ(restricted dataの意味) / 地方配達(rural delivery: 米国でかつて郵便の宛先表記に用いられた方法)
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( plural )