n. प्रतिध्वनिमापी (पु.)

(determination of a distance and direction of an object as under water by means of an echo returned by the object) प्रतिध्वनि स्थानन

(the determination of depth of water by the measurement of the time interval required for a sonic or supersonic pulse reach the transmission point after being reflected from the bottom) प्रतिध्वनि गभीरता परिज्ञापन

n. १ Acous. (a sound-wave which has been reflected at one or more points with sufficient magnitude,. . . . . . .etc.) प्रतिध्वनि (पु.) २ Radar (as, sound or visual indication caused by a reflected radio-wave or radio signal) प्रतिक्षिप्त (न.)

Light सोपान जाल, एशेलॉन जाल

सोपान घट, एशेलॉन घट

n. (as, a highly specialised from of diffraction grating) सोपान (पु.), एशेलॉन (पु.)

Optics सोपान जाल, एशेल जाल

n. सोपान (पु.), एशेल (पु.)

n. सोपानक (पु.), एशेलेट (पु.)