名詞 d:

1. a fat-soluble vitamin that prevents rickets
   同義詞：vitamin D, calciferol, viosterol, ergocalciferol, cholecarciferol
2. the cardinal number that is the product of one hundred and five
   同義詞：five hundred, 500
3. the 4th letter of the Roman alphabet
   同義詞：letter d

形容詞 d:

1. denoting a quantity consisting of 500 items or units
   同義詞：five hundred, 500

d 或 D

n.（名詞）
【復數】 d`s 或 D`s
The fourth letter of the modern English alphabet.
字母D：現代英語字母表中的第四個字母
Any of the speech sounds represented by the letterd.
D音：字母d 所表示的讀音
The fourth in a series.
第四：序列中的第四
Music
【音樂】
The second tone in the scale of C major or the fourth tone in the relative minor scale.
D音，D調：C大調音階的第二個音或C小調音階中的第四個音
A key or scale in which D is the tonic.
D鍵，D階：以D音為主調音的琴鍵或音階
A written or printed note representing this tone.
D音符：代表D調的手寫體或者印刷體的音符
A string, key, or pipe tuned to the pitch of this tone.
D調樂器：調至D調音高的弦樂器、琴鍵或管樂器
D The lowest passing grade given to a student in a school or college.
D 學業(yè)成績?。涸谥袑W或大學里，給學生的最低及格的分數
Something shaped like the letter D.
D形物：形狀象字母D的物體

d
d 2
abbr.（略語）
Day.
Day.
Deuteron.
Deuteron.
Physics Down quark.
【物理學】 Down quark.