D defs.my
Entry 3 senses Webster, 1913

Protector

/prət-ĕk'-tẽr/ · Pro·tect·or · IPA /pɹəˈtɛktɚ/
01 n. One who, or that which, defends or shields from injury, evil, oppression, etc.; a defender; a guardian; a patron.
  1. 1.
    One who, or that which, defends or shields from injury, evil, oppression, etc.; a defender; a guardian; a patron.
    “For the world's protector shall be known.” Waller.
  2. 2.
    One having the care of the kingdom during the king's minority; a regent.(Eng. Hist.)
    “Is it concluded he shall be protector !” Shak.
  3. 3.
    A cardinal, from one of the more considerable Roman Catholic nations, who looks after the interests of his people at Rome; also, a cardinal who has the same relation to a college, religious order, etc.(R. C. Ch.)
Phrases & compounds
Lord Protector — the title of Oliver Cromwell as supreme governor of the British Commonwealth (1653-1658).