English
fathomable
From fathom + -able.
A compound of fathom + -able
Proto-Indo-European *pet- ‘to spread out’
Proto-Germanic *faþmaz ‘outstretched arms, embrace’
Proto-West Germanic *faþm ‘outstretched arms, embrace’
Old English fæþm ‘encircling or outstretched arms, bosom, embrace’
Middle English fathome ‘unit of length of about six feet’
English fathom
Today it means
adj able to be fathomed
Language periods are conventional ranges, not dates for this word.
Etymograph / fathomable