tablespoonful

Concise Oxford English Dictionary © 2008 Oxford University Press:
tablespoon/ˈteɪblspuːn/

▶noun a large spoon for serving food.

■ (abbrev.: tbsp) the amount held by such a spoon, in the UK considered to be 15 millilitres when used as a measurement in cookery.

– derivatives
tablespoonful noun (pl. tablespoonfuls).