dee
n. countable C2 Proficiency US //ˈdi// dee
n. the name of the fourth letter of the English alphabet, D. You might see this spelling in older books or when someone is naming the letter itself.
n. the phonetic or orthographic representation of the fourth letter of the English alphabet. Often used in plural form to describe the shape of an object or a specific grade in an evaluation system.
The word 'dog' starts with a dee.
The architect designed the garden path in the shape of a large capital dee.
In older typeset manuals, the letter was occasionally referred to by its full name, dee, to avoid confusion with numerical digits in the margin.
Usage
The plural is usually written as 'dees'.