D

I

symb.

1) the fourth in order or in a series

2) edu (sometimes l.c.) (in some grading systems) a grade or mark indicating poor or barely acceptable quality

3) mad

a) the second note of the ascending C major scale

b) a tonality having D as the tonic

4) (sometimes l.c.) the Roman numeral for 500

Compare Roman numerals

5) chem. deuterium

6) biochem.

aspartic acid II

1) deep

2) depth

3) opt diopter

4) divorced

5) Dutch