Tablespoonful n. : As much as a tablespoon will hold; enough to fill a tablespoon. It is usually reckoned as one half of a fluid ounce, or four fluid drams.

Example:
How many teaspoonful or Tablespoonful of, say, oatmeal, is equal to 10 grams of oatmeal?

Taxonomy
level tablespoon, ml, tablespoonful, spoonful, free encyclopedia, capacity, spoon, tb, Relationship, teaspoon, solids, unit of volume, Australian, International System of units, Measuring Spoons, Variants, search, approximately equal.

Defination from the web:
tablespoonful, an amount approximately equal to the capacity of one tablespoon, is commonly used as a measure of volume in cooking. ... How much is a tablespoonful?". Vet Hum Toxicol. ^ A. Thompson and B. N. Taylor. The NIST Guide for the use of International System of Units. ...