1. [adv]  under or below an object or a surface; "we could see the original painting underneath"
2. [adv]  beneath by way of support; "a house with a good foundation underneath"
3. [adv]  lower down on the page; "diagrams with figures underneath"
4. [adv]  on he lower or downward side; "a chest of drawers all scratched underneath"

UNDERNEATH is a 10 letter word that starts with U.

1. \Un`der*neath"\, adv. [OE. undirnepe. See {Under},
   and {Beneath}.]
   Beneath; below; in a lower place; under; as, a channel
   underneath the soil.
   
         Or sullen mole, that runneth underneath. --Milton.
   
   

2. \Un`der*neath"\, prep.
   Under; beneath; below.
   
         Underneath this stone lie As much beauty as could die.
                                                  --B. Jonson.