MEANING: noun.
1. A very short person.
2. An insignificant or unimportant person, especially one who lacks the power or ability in spite of high rank.

ETYMOLOGY: After Tom Thumb, the hero of many folktales, who is the size of his father’s thumb. Earliest documented use: 1579. Also see lilliput and lilliputian.

TOM THOMB - a tiny but fully functional Native American drum

TOE THUMB - vernacular for hallux

TOM RHUMB - nickname for Tom Loxodrome, a gifted navigator of the Sixteenth Century and contemporary of Gerardus Mercator, the mapmaker