achromatic light
白光，消色差光，无彩(色)光

• pseudooptical band
• pseudo-order
• pseudophotoesthesia
• pseudopolarization vector
• pseudo-program
• pseudorandom
• pseudorandom code
• pseudoscope
• pseudoscopic image
• pseudoscopy
• pseudothermal light
• psophmeter
• psychological attributes hue
• psycho-optical moement
• psychovisual coding area
• psychrometer
• Ptosis crutch
• p-type conduction
• p-type gallium arenside
• publick unisance
• pulastion
• Pulfrich refractometer
• puller
• pulley
• pull-in frequency