Latin

Noun

littera canīna f ‎(genitive litterae canīnae); first declension

1. the letter R (literally dog's letter, after its trilled pronunciation in Latin)
   • Persius, Satires 1.108-110:

     Vide sis ne maiorum tibi forte limina frigescant: sonat hic de nare canina littera.‎

     Take care the thresholds of the great don’t grow chilly towards you: this is where you’ll hear the snarl of a dog’s rrrr.

Declension

First declension.
First declension.