Fathom

fath'um, n. A measure of length = feet; space to which a man can extend his arms. —-v.v. [fathomed (-uind), -©Ming.] To measure by a sounding line; esp., to sound the depth of, get to the bottom of. [AS. fsedhm, D. vadem, Ic. fadhmr, Dan. favn, G.faden, a fathom, Sw.famn, embrace, arms; AS. fsedhman, to fathom. — Fath'omable, a. — Fatb/omle , a. Incapable of being fathomed.