http://onelook.com/ Both definitions came from Dorland's using OneLook.com
osteomeatal (os·teo·me·at·al) (oste-o-me-at[schwa]l) pertaining to a nasal meatus and one of the bones of the face.
ostiomeatal (os·tio·me·a·tal) (oste-o-me-at[schwa]l) [ostium + meatal] pertaining to the opening of the urinary, nasal, or acoustic meatus.