teacup

UK: /ˈtiːkʌp/ US: /ˈtiˌkʌp/ ,(tē′kup′)

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

tea•cup /ˈtiˌkʌp/   n. [countable]

1. a cup in which tea is served.
2. the amount a teacup holds.

WordReference Random House Unabridged Dictionary of American English © 2025

tea•cup  (tē′kup′), n. 

1. a cup in which tea is served, usually of small or moderate size.
2. a teacupful.
3. tempest in a teacup or teapot, a disturbance or uproar about little or nothing:
   The fight over who should become the next assistant treasurer of the organization is just a tempest in a teacup.

Also, storm in a teacup. 

• tea + cup 1690–1700

Collins Concise English Dictionary © HarperCollins Publishers::

teacup / ˈtiːˌkʌp/ noun

1. a cup out of which tea may be drunk, larger than a coffee cup
2. Also called: teacupful the amount a teacup will hold, about four fluid ounces