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Latin word -iscus comes from Proto-Indo-European *-iskos (Characteristic of, typical of, pertaining to.)
*-iskos (Proto-Indo-European)
Characteristic of, typical of, pertaining to.
*-iskaz (Proto-Germanic)
Forms adjectives from nouns with the sense of 'pertaining to, characteristic of'.
-iscus (Latin)
(Late Latin, Medieval Latin) Used to form adjectives.