D

名词 d:

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

形容词 d:

1. denoting a quantity consisting of 500 items or units
   同义词：five hundred, 500

d 或 D

n.（名词）
【复数】 d`s 或 D`s
The fourth letter of the modern English alphabet.
字母D：现代英语字母表中的第四个字母
Any of the speech sounds represented by the letterd.
D音：字母d 所表示的读音
The fourth in a series.
第四：序列中的第四
Music
【音乐】
The second tone in the scale of C major or the fourth tone in the relative minor scale.
D音，D调：C大调音阶的第二个音或C小调音阶中的第四个音
A key or scale in which D is the tonic.
D键，D阶：以D音为主调音的琴键或音阶
A written or printed note representing this tone.
D音符：代表D调的手写体或者印刷体的音符
A string, key, or pipe tuned to the pitch of this tone.
D调乐器：调至D调音高的弦乐器、琴键或管乐器
D The lowest passing grade given to a student in a school or college.
D 学业成绩丁：在中学或大学里，给学生的最低及格的分数
Something shaped like the letter D.
D形物：形状象字母D的物体

d
d 2
abbr.（略语）
Day.
Day.
Deuteron.
Deuteron.
Physics Down quark.
【物理学】 Down quark.