
1) Country great Tex 2) Cowboy singer Tex 3) German boy name 4) Jason of The Event 5) John of old sitcoms 6) John of Skin Deep 7) John or tex 8) Occupational surname 9) Roll, Wagons, Roll star 10) Singer of the High Noon theme 11) Singing cowboy tex 12) Skin Deep star 13) Tex of country music 14) Tex or John 
Found on 
https://www.crosswordclues.com/clue/ritter

1) Tex 
Found on 
https://www.crosswordclues.com/clue/ritter

knight, cavalier.
Found on 
http://en.wikipedia.org/wiki/Glossary_of_German_military_terms

 Ritter (German for `knight`) is a designation used as a title of nobility in German-speaking areas. Traditionally it denotes the second lowest rank within the nobility, standing above `Edler` and below `Freiherr` (Baron). For its historical association with warfare and the landed gentry in the Middle Ages, it can be considered roughly equal ...
Found on 
http://en.wikipedia.org/wiki/Ritter
 [crater]
[crater]  Ritter is a lunar crater located near the southwestern edge of Mare Tranquillitatis. It is the northwestern member of a crater pair with Sabine to the southeast. The two rims are separated by a narrow valley only a couple of kilometers wide. To the northwest is the crater Dionysius, and to the north-northeast are Manners and Arago....
Found on 
http://en.wikipedia.org/wiki/Ritter_(crater)

Type: Term Pronunciation: rit′ĕr Definitions: 1. Johann W., German physicist, 1776-1810. See: Ritter opening tetanus, Ritter-Rollet phenomenon
Found on 
http://www.medilexicon.com/medicaldictionary.php?t=78784
  No exact match found.