Echoless :: Echoless (a.) Without echo or response.
Echometer :: Echometer (n.) A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals..
Echometry :: Echometry (n.) The art of measuring the duration of sounds or echoes.
Echometry :: Echometry (n.) The art of constructing vaults to produce echoes.
Mechoacan :: Mechoacan (n.) A species of jalap, of very feeble properties, said to be obtained from the root of a species of Convolvulus (C. Mechoacan); -- so called from Michoacan, in Mexico, whence it is obtained..