silverback

noun4

1. •
   A mature male gorilla leading a troop, so named from the silver streaking on its back.
2. •
   (informal) A dominant or powerful older human male.

   • Courageously (given Ranger's status in Mugabe's Zimbabwe, and his status as a silverback in North Atlantic Academe), Kriger dissents from their arguments. — 2001
3. •
   Any of various ferns of the genus Pityrogramma.
4. •
   Any member of the species Rhodamnia cinerea of plants of southeastern Asia.