Thu·cyd·i·des 
(th-sĭdĭ-dēz′) 460?-400? BC.
(th-sĭdĭ-dēz′) 460?-400? BC. Greek historian noted for the unprecedented objectivity and thoroughness of his critical history of the Peloponnesian War.
- diff
- differ
- difference
- different
- differentia
- differentiability
- differentiable
- differential
- differential analyzer
- differential calculus
- differential coefficient
- differential equation
- differential gear
- differentially
- differential rate
- differentiate
- differentiation
- differently
- differently abled
- differentness
- difficult
- difficultly
- difficulty
- diffidence
- diffident