1. To that or this.

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

• theret,
• thereoy,
• thirety,
• thento,
• therei,
• theree,
• thearete,
• thert,
• therte,
• theroty,
• therea,
• therey,
• threton,
• thereom,
• theet,
• therst,
• therepy,
• oxheartt,
• theeeto,
• theeto

• thorite,
• therewith,
• threat,
• thoriate,
• theriot,
• throw out,
• throat,
• Threet,
• throaty,
• three-d,
• terete,
• thirty,
• thyroid,
• third,
• threatt.

The adjective form of the word "thereto" is "theretofore".

The plural form of "thereto" is "theretos".

The singular form of the word "thereto" is "thereto". This word is already in the singular form and does not have a specific singular form.