| PROTO | (combining form) indicating the first or earliest or original |
|---|---|
| PROTO | a prehistoric unrecorded language that was the ancestor of all Indo-European languages |
| PROTO | the Germanic language of Scandinavia up until about 700 |
| PROTO | a normal gene that has the potential to become an oncogene |
| PROTO | a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead |
| PROTO | the study humans prior to the invention of writing |
| PROTO | the study of prehistoric human artifacts and human fossils |
| PROTO | the study of prehistoric human artifacts and human fossils |
| PROTO | most primitive avian type known |
| PROTO | small horned dinosaur |
| PROTO | code of correct conduct |
| PROTO | forms of ceremony and etiquette observed by diplomats and heads of state |