/awr thoh"sis/ , n. , pl. orthoses /-seez/ .
1. Med. the correction of orthopedic maladjustments.
2. an orthotic.
[ 1955-60; órthosis a making straight, guidance, equiv. to ortho- (var. s. of orthoûn to straighten, v. deriv. of orthós straight) + -sis -SIS ]