Fathom Definition

făthəm
fathoms
noun
fathoms
A unit of length used to measure the depth of water or the length of a nautical rope or cable, equal to 6 ft (1.8288 m)
Webster's New World

(nautical) A measure of length corresponding to the outstretched arms, standardised to six feet, now used mainly for measuring depths in seas or oceans.

Wiktionary

(by extension) Mental reach or scope; penetration; the extent of capacity; depth of thought or contrivance.

Wiktionary
Synonyms:
  • fthm
verb
fathoms
To penetrate to the meaning or nature of; comprehend.
American Heritage
To measure the depth of; sound.
Webster's New World
To get to the bottom of; understand thoroughly.
Webster's New World

(archaic) To encircle with outstretched arms, especially to take a measurement; to embrace.

Wiktionary
Antonyms:

Other Word Forms of Fathom

Noun

Singular:
fathom
Plural:
fathoms

Origin of Fathom

  • From Middle English fathome, fadome, from Old English fæþm, fæþme (“outstretched or encircling arms, embrace, grasp, protection, interior, bosom, lap, breast, womb, fathom, cubit, power, expanse, surface”), from Proto-Germanic *faþmaz (“embrace”), from Proto-Indo-European *pet- (“to spread out, extend”). Cognate with Low German fadem, faem (“a cubit, thread”), Dutch vadem, vaam (“fathom”), German Faden (“thread, filament, fathom”), Danish favn (“embrace, fathom”), Swedish famn (“the arms, bosom, embrace”), Icelandic faðmur (“embrace”).

    From Wiktionary

  • Middle English fathme from Old English fæthm outstretched arms petə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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