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125.
 Adjectives in -er form the Superlative by adding -rimus to the nominative.  The comparative is
regular: -  
-  
- ácer, keen; ácrior,
ácerrimus.  
- miser, wretched; miserior, miserrimus. 
a. So vetus (gen.  veteris) has superlative veterrimus, from the old form veter; and mátúrus, besides its regular
superlative (mátúrissimus), has a rare form
mátúrrimus.  
For the comparative of vetus,
vetustior (from vetustus)
is used. 
 
 
 
