Definition of geminate adjective from the Oxford Advanced Learner's Dictionary

 

geminate

 adjective
adjective
BrE BrE//ˈdʒemɪneɪt//
 
; NAmE NAmE//ˈdʒemɪneɪt//
 
; BrE BrE//ˈdʒemɪnət//
 
; NAmE NAmE//ˈdʒemɪnət//
 
(phonetics)
 
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(of a speech sound) consisting of the same consonant pronounced twice, for example /kk/ in the middle of the word backcomb Word Origin late Middle English: from Latin geminatus, past participle of geminare ‘double, pair with’, from geminus ‘twin’.
See the Oxford Advanced American Dictionary entry: geminate