- defoamer
- defoaming agents
- defocus
- defocused beam
- defocused image
- defocused reflector
- defocusing
- defocussing
- defocus spread
- defo-elasticity
- defogging
- defoliater
- defoliating agent
- defoliation
- defoliators
- defo-meter
- defometer
- deforestation
- De Forest crater
- deformability
- deformable
- deformable body
- deformable earth rotation dynamics
- deformable mirror
- deformable particle