DefaultBaseStyle is a low-level option for formatting and related constructs that specifies a default base style to use before BaseStyle.
DefaultButton[] represents an OK button that closes a dialog, and is the default when DynamicBox[ToBoxes[If[$OperatingSystem === "MacOSX", "Return", "Enter"], StandardForm], ...
DefaultFrameStyle is a low-level option for graphics and related constructs that specifies the default style to use in displaying their frames.
DependentVariables is an option which specifies the list of all objects that should be considered as dependent variables in equations that have been supplied.
Deploy
(Built-in Mathematica Symbol) Deploy[expr] yields a deployed version of expr in which elements such as Slider, InputField, Locator, and Button are active, but general editing and selection is disabled.
Dilation[image, ker] gives the morphological dilation of image with respect to the structuring element ker.Dilation[image, r] gives the dilation with respect to a range r ...
Directive[g_1, g_2, ...] represents a single graphics directive composed of the directives g_1, g_2, ....
DirectoryName["name"] extracts the directory name from the specification for a file.
DistanceFunction is an option for functions such as Nearest that specifies the distance value to assume between any two specified points.
DistanceTransform[image] gives the distance transform of image, in which the value of each pixel is replaced by its distance to the nearest background ...