teaspoonful

UK: /ˈtiːspuːnfʊl/ US: (tē′spo̅o̅n fŏŏl′)

Inflections of 'teaspoonful' (n): npl: teaspoonfuls

WordReference Random House Unabridged Dictionary of American English © 2025

tea•spoon•ful  (tē′spo̅o̅n fŏŏl′), n., pl. -fuls. 

1. the amount a teaspoon can hold.
2. a volumetric measure equal to ¹⁄₆ fluid ounce (4.9 ml);
   ¹⁄₃ tablespoonful. Abbr.: t., tsp.

• teaspoon + -ful 1725–35

Usage

See -ful. 

Collins Concise English Dictionary © HarperCollins Publishers::

teaspoonful / ˈtiːspuːnfʊl/ noun
another word for teaspoon2

WordReference Random House Learner's Dictionary of American English © 2025

tea•spoon /ˈtiˌspun/   n. [countable]

1. a small spoon used to stir tea and coffee, eat dessert, etc.
2. a cooking measure equal to 1/6 fluid ounce (4.9 ml).

tea•spoon ful, n. [countable] , pl. -fuls. 

WordReference Random House Unabridged Dictionary of American English © 2025

tea•spoon  (tē′spo̅o̅n′), n. 

1. a small spoon generally used to stir tea, coffee, etc.
2. a teaspoonful.

• tea + spoon 1680–90