What does the word headache mean?

Usage examples for headache

  1. She's come back with a dreadful headache and can't go out to dinner with us. – A Top-Floor Idyl by George van Schaick
  2. She had a headache." – The Vultures by Henry Seton Merriman
  3. Perhaps she is sick, and can't get here- She said she'd a headache last night. – Point Lace and Diamonds by George A. Baker, Jr.