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dike an embankment built to prevent flooding; levee. [6 definitions]
dilapidate to let (something) go to ruin or decay, as by neglect, or to become ruined or decayed.
dilapidated fallen into disrepair or decay, esp. from neglect or overuse.
dilatation in medicine, the state or condition of abnormal enlargement of an organ, cavity, or canal of the body.
dilate to make wider or larger; enlarge; expand. [3 definitions]
dilation the process of enlarging an organ such as the cervix or the pupil of the eye. [2 definitions]
dilatory tending to delay; slow. [2 definitions]
dildo an object made of rubber, plastic, or the like to simulate an erect penis.
dilemma a problem that requires a choice between equally undesirable solutions or that resists satisfactory solution. [2 definitions]
dilettante one who pursues an activity or interest in a superficial or frivolous way; dabbler. [2 definitions]
diligence careful and sustained effort.
diligent continually attending to and striving to achieve a goal; assiduous; persevering. [2 definitions]
dill an aromatic herb of the celery family, or its fine leaves or seeds used as flavoring or medicine. [2 definitions]
dill pickle a pickled cucumber flavored with dill.
dilly (informal) something exceptional of its kind.
dilly-dally to waste time by hesitating or loitering; dawdle.
diluent causing dilution; diluting. [2 definitions]
dilute to make (a solution) thinner or less concentrated by adding more solvent. [4 definitions]
dilution the act of diluting or state of being diluted. [2 definitions]
diluvial of or caused by a glacier or flood.
dim poorly lighted. [9 definitions]