behind the ear
(medicine) Describing a type of hearing aid with microphone, amplifier, and battery that sit in a unit behind the wearer's auricle, and the amplified sound is passed down a tube into the ear canal.
(inorganic chemistry) The nitrogen-fixation reaction of nitrogen gas and hydrogen gas, over an enriched iron or ruthenium catalyst, used industrially to produce ammonia.
plural of standard error
plural of chaperoning
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