Answer: microscopic

AnswerCrossword Clue
MICROSCOPICNearly invisible
MICROSCOPICInfinitesimal
microscopicConcerned with minute detail
microscopicOf or relating to a microscope
microscopicSo small as to be visible only with a microscope
microscopicExtremely small
microscopicable to be seen only though a microscope also MICROSCOPICAL