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differentiation the act of differentiating, or the process or condition of being differentiated. [2 definitions]
differently in another or new way. [2 definitions]
difficult hard to accomplish or understand. [3 definitions]
difficulty the quality or condition of being difficult. [6 definitions]
diffidence reticence; shyness.
diffident unsure of oneself; shy; demure. [2 definitions]
diffract to cause diffraction of, or undergo diffraction.
diffraction modification of light or other waves by partially obstructing them so that they bend around the obstruction and break into bands of different frequencies.
diffraction grating a set of equidistant parallel lines or grooves made very close together on glass or polished metal, used to diffract light and produce a spectrum.
diffuse to pour (a liquid or gas) or to allow to flow out and spread freely. [10 definitions]
diffusion the spreading or wide scattering of something. [3 definitions]
diffusive marked by diffusion.
dig to make a hole by removing dirt, sand, or the like. [8 definitions]
digest to break down or promote the breaking down of (food) into substances that can be absorbed by body tissues. [8 definitions]
digestible capable of being digested or absorbed.
digestion the process by which the body converts food into absorbable substances. [3 definitions]
digestive of or pertaining to digestion. [3 definitions]
digestive juice any or all of the fluids produced by the body to digest food, such as secretions by the salivary glands, stomach walls, pancreas, and liver.
digestive system the parts of the body that work together to break down food so that it can be used by the body as energy. The human digestive system includes the mouth, esophagus, stomach, and intestines.
digger a person or a machine, tool, or the like that digs or excavates. [3 definitions]
digger wasp any of various wasps that paralyze spiders and other prey with their stingers, then lay eggs on them in underground nests.