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Latin somnium
← Old Church Slavonic съниѥ (cognate)
← Proto-Indo-European *swep- (root)
← Proto-Indo-European (inherited)
← Proto-Indo-European *swep- (mention)
← Latin somnus (mention)
← Latin somnus (suffix)
← Latin ium (suffix)
← Lithuanian sapnỹs (cognate)
← Sanskrit स्वप्न्य (cognate)
← Tocharian B sänmetse (cognate)

→ English somnial (mention)
→ Asturian suañu (inherited)
→ Asturian sueñu (mention)
→ Catalan somni (borrowed)
→ Esperanto sonĝo (derived)
→ Spanish sueño (inherited)
→ Spanish ensueño (inherited)
→ French songe (inherited)
→ Old French songe (inherited)
→ Friulian sium (inherited)
→ Galician soño (inherited)
→ Istriot sugno (inherited)
→ Italian sogno (inherited)
→ Latin somnio (suffix)
→ Old Spanish suenno (inherited)
→ Portuguese sonho (inherited)
→ Romansch siemi (inherited)
→ Romani suno (derived)
→ Old Armenian -ի (mention)