English Reference
noun

protector

n.
US /pɹəˈtɛktɝ/ UK /pɹətˈɛktɐ/ pro·tec·tor UK spelling protector's, protector's

  1. 01 B2 Upper Intermediate

    someone who keeps you safe from danger or harm.

    a person who protects or guards another person, an object, or a place, either by official assignment or personal initiative.

    Simple

    The dog was a loyal protector of the family home.

    In context

    Throughout the trial, the witness viewed the lead detective as her sole protector against the threats of the criminal organization.

  2. 02 B2 Upper Intermediate

    a piece of equipment that prevents something from being damaged.

    a mechanical device or physical covering designed to prevent injury, wear, or damage.

    Simple

    You should use a screen protector to keep your phone from scratching.

    In context

    The electrician installed a surge protector to ensure the sensitive laboratory equipment would not be damaged by power fluctuations.

  3. 03 C1 Advanced FormalBritish English

    a person who ruled a country while the king was too young or away.

    a historical title for a person appointed to govern a kingdom during the monarch's minority or absence, notably the Lord Protector.

    Simple

    Oliver Cromwell was given the title of Lord Protector of the Commonwealth.

    In context

    The Duke served as the young king's protector, managing the affairs of the state until the boy reached his sixteenth birthday.

    Teacher's tip

    This sense is almost exclusively found in history books, particularly regarding English history.

When in place, it acts as a protector that keeps anything on the left side of the bike from sliding through the frame and getting tangled in the chain.

Ars Technica· 26 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated