フェムト秒 です
femutobyōdesu
1. Femtosecond.
Noun
#365085
1. Femtosecond.
1. cowardly; timid
1. heart disease; heart trouble
1. skin disease
1. second (unit of time)
2. arc second
1. adult diseases
1. countdown
1. Minamata disease
1. diabetes; diabetes mellitus
1. leukemia; leukaemia