teaspoonful

teaspoon +‎ -ful

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teaspoonful (plural teaspoonfuls or teaspoonsful)

1. A unit of capacity equal to the amount a teaspoon can hold which is taken approximately as 5ml.
   • 1960, P[elham] G[renville] Wodehouse, chapter XVII, in Jeeves in the Offing, London: Herbert Jenkins, OCLC 1227855:

     “When I say mind,” said the blood relation, “I refer to the quarter-teaspoonful of brain which you might possibly find in her head if you sank an artesian well.”

• dessertspoonful
• tablespoonful
• spoonful