English
fathomability
From fathom + -ability.
Formed from fathom + -ability
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
noun The quality of being fathomable.
Language periods are conventional ranges, not dates for this word.
Etymograph / fathomability