|Italic||Latin caecus 'blind'|
|Celtic||Old Irish caech 'one-eyed', Welsh coeg 'empty', Old Cornish cuic|
|Indic||Sanskrit kekara- 'squint-eyed'|
|Germanic||Gothic haihs 'blind'|
|Notes:||This root could be regarded as the so-called
"European" word, unless the Old Indic word which proves the Common Indo-European
origin of the root.
In fact, the diphthong *ai was rather rare in Indo-European, as well as the very sound *a. There can be maybe 10 or 15 roots which contain this diphthong found among the Proto-Indo-European corpus. Were they loanwords from some other language?