D, n.
the 4th letter of the Roman alphabet
<noun.communication>
D d
semantic pointers
member holonym
hypernym
the cardinal number that is the product of one hundred and five
<noun.quantity>
500 D five hundred
semantic pointers
hypernym
a fat-soluble vitamin that prevents rickets
<noun.substance>
D calciferol cholecalciferol ergocalciferol viosterol vitamin D