Letter D

Root : demos
Meaning : people
Words from the same root : 

• democracy [demos + cracy (rule)] : rule by the people
• pandemic [pan (all) + demos] : prevalent throughout an entire country
• epidemic [epi (over) + demos] : affecting many people at the same time

Root : dictum 

Meaning : speak/word

Words from the same root : 

• benediction : [bene (good) + dictum] : blessing (good word)
• malediction : [mal (bad) + dictum] : curse (bad word)
• diction : right use of the word

Root : duc

Meaning : to lead

Words derived from the same root :

• ductile : easily led
• abduct : [ab (away) + duct] : to lead away
• seduce : [se (apart) + duct] : to lead astray

Prefix : du/di

Meaning : two

Words derived from the same :

• dilemma : [di (two) + lemma (proposition)] : a situation requiring a choice between equally undesirable alternatives.
• duplex : a housedivided into two separate dwellings
• duet : a musical composition for two voices or instruments.

Root : dent/dont

Meaning : teeth

Words derived from the same :

• dentist : a person licensed in the care and replacement of teeth
• dentures : a partial or a complete set of false teeth
• orthodontist [ortho (straight) + dentis] : the branch of dentistry dealing with the prevention and correctionof irregular teeth, as by means of braces.