dire - drif
- direct action
- direct calculation
- direct calculus
- direct capacitance
- direct correlation
- direct correspondence
- direct coupling
- direct current
- direct current discharge
- direct current source
- direct cycle
- direct dependence
- direct effect
- direct exchange
- direct excitation
- direct heating
- direct heating triode
- direct illumination
- direct image
- direct impact
- direct interaction
- direct lattice
- direct measurement
- direct method of measurement
- direct nuclear reaction
- direct observation
- direct proportionality
- direct radiation
- direct reading
- direct recombination
- direct recording
- direct reflection spectrum
- direct transition
- direct vision
- direct vision spectroscope
- direct wave
- direct-coupled amplifier
- direct-coupled amplifier
- direct-current ammeter
- direct-current amplifier
