nebenkern

noun

ne·​ben·​kern ˈnā-bən-ˌkərn  -ˌkern 

: a two-stranded helical structure of the proximal tail region of a spermatozoon that is derived from mitochondria

Word History

Etymology

German, literally, subsidiary nucleus

First Known Use

1895, in the meaning defined above

Medical Definition

nebenkern

noun

ne·​ben·​kern ˈnā-bən-ˌkərn  -ˌke(ə)rn 

: a two-stranded helical structure of the proximal tail region of a spermatozoon that is derived from mitochondria