1. As much as the lap can contain.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• papful,
• oapful,
• lzpful,
• lspful,
• lwpful,
• lqpful,
• laoful,
• lalful,
• la-ful,
• lapfup,
• lapfuo,
• lapfu,
• lapfull,
• lepful,
• lapfuh,
• laphul,
• lephul,
• lapfool,
• lepfull,
• lapfulll

• lappula,
• lawful,
• Laipple,
• lawfully,
• cupful,
• label,
• playful,
• lapel.

The adjective form of the word "lapful" is "lapful". The word "lapful" doesn't have a standard adjective form.

The plural of the "lapful" can be the "lapfuls".

The singular of the "lapful" can be the "lapful".