amicissimus
amicissimus is a Latin form of amicus, meaning “friend; (adj.) friendly”. It is the nominative singular masculine superlative adjective or vocative singular masculine superlative adjective.
Found 30 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 8.44.6: hunc Epasnactus Arvernus, amicissimus populi Romani, sine dubitatione ulla vinctum ad Caesarem deduxit.
All forms of amicus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.