n.1.A kind of ear trumpet for the deaf, or the partially deaf.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The as-obtained graphite oxide slurry was redispersed in DI water and then exfoliated by ultrasonication using a Brandson Digital Sonifer (S450D, 35% amplitude) to generate graphene oxide nanoflakes.
Nanographite powders were first dispersed in IPA and sonicated using a Branson Sonifer for 1 h.
ROFA (suspended in sterile saline) was sonicated for 1 min with a Sonifer 450 cell disruptor (Branson Ultrasonics, Danbury, CT) before IT instillation.