Where does “Slavonicism” come from?

Slavonicism (English) comes from English Slavonic, from Medieval Latin Slavonicus, from Latin Sclavonia, from Latin Sclavus, from Byzantine Greek Σκλάβος, from Proto-Slavic slověninъ, from Proto-Slavic slovo, from Proto-Balto-Slavic ślawas — to cover; to incline.

Slavonicism (English): denoting a word or other linguistic feature borrowed from or formed under influence of Old Church Slavonic or some later Church Slavonic recension

Definitions

  1. denoting a word or other linguistic feature borrowed from or formed under influence of Old Church Slavonic or some later Church Slavonic recension

Ancestry of “Slavonicism”, step by step

Slavonicism traces back through two separate lines of ancestry.

via English Slavonic

StepLanguageWordMeaning
1EnglishSlavonicOf, denoting, or relating to the people who speak...
2Medieval LatinSlavonicus
3LatinSclavoniaSlavonia
4LatinSclavusa Slav
5Byzantine GreekΣκλάβοςSlav
6Proto-SlavicslověninъSlav
7Proto-Slavicslovoword
8Proto-Balto-Slavicślawas
9Proto-Indo-Europeanḱléwosfame
10Proto-Indo-Europeanḱlew-to hear
11Proto-Indo-Europeanḱel-to cover; to incline

via English ism

StepLanguageWordMeaning
1EnglishismAn ideology, system of thought, or practice that...
2English-ismUsed to form nouns of action or process or result...
3Latin-ismus-ism
4Ancient Greek-ισμόςForms abstract nouns
5Ancient Greek-μόςForms abstract nouns
6Proto-Indo-European-mósCreates action/result nouns from verb stems
Every word from Proto-Indo-European ḱel-Every word from Proto-Indo-European ḱlew-Every word from Proto-Indo-European ḱléwos