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plural teaspoonfuls or teaspoonsful
A unit of capacity equal to the amount a teaspoon can hold which is taken approximately as 5 ml. quotations examples
“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.”
1960, P[elham] G[renville] Wodehouse, chapter XVII, in Jeeves in the Offing, London: Herbert Jenkins