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Webster 1913 Edition

Adj.

Pertaining to, or derived from, Japheth, one of the sons of Noah;

as,

Japhetic

nations, the nations of Europe and Northern Asia;

Japhetic

languages.

Adj.

Pertaining to Japheth, the eldest son of Noah; as the Japhetic nations, which people the North of Asia and all Europe; Japhetic languages.

Japhetic ‎(not comparable)

(obsolete, ethnography) Of or pertaining to the supposed descendants of Japheth, one of the three sons of Noah in the Bible.
(obsolete) Of or pertaining to the supposed languages spoken by the descendants of Japheth, son of Noah in the Bible.