koyn

Possibly from the earlier form *koy-nu, from Proto-Tocharian *koy (whence also Tocharian A koy- (“mouth”)), from Proto-Indo-European *ǵʰh₂óyu (“gape”, noun), from the root *ǵʰh₂ey-, extended from the original root *ǵʰeh₂- (“to open wide, gape, yawn”). The verb kāyā (“to open wide, gape”) derives from the same root. Compare Latin hiō (“I stand open; I gape, yawn”), Lithuanian žióju (“I open”), Proto-Slavic *zijati (“to be open; to gape”), Old English ġinian (“to gape, yawn”).

koyn n

1. (anatomy) mouth

• koyñi (“open wound”)

• Adams, Douglas Q. (2013) “koyn”, in A Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European; 10), Amsterdam, New York: Rodopi, →ISBN, pages 216–217