1. ground swell a broad and deep undulation of the ocean
  2. groundsel Eurasian weed with heads of small yellow flowers
  3. ground ball (baseball) a hit that travels along the ground
  4. groundball (baseball) a hit that travels along the ground
  5. grandiosely in a grandiose manner
  6. ground zero the target of a projectile (as a bomb or missile)
  7. groundless without a basis in reason or fact
  8. ground rule (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds
  9. grounds your basis for belief or disbelief
  10. ground sloth gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America
  11. groundspeed the speed of an aircraft relative to the ground
  12. groundsheet a waterproofed piece of cloth spread on the ground (as under a tent) to protect from moisture
  13. ground level the height of the ground on which something stands
  14. grandiose impressive because of unnecessary largeness or magnificence
  15. groundsman someone who maintains the grounds
  16. grandson a male grandchild
  17. ground state the lowest energy state of an atom or other particle
  18. ground beetle predacious shining black or metallic terrestrial beetle that destroys many injurious insects
  19. groundwork preliminary preparation as a basis or foundation
  20. groundsel tree a shrub of salt marshes of eastern and south central North America and West Indies; fruit is surrounded with white plumelike hairy tufts