Ioʹta
or Jot: A very little, the least quantity possible. The iöta [ι] is the smallest letter of the Greek alphabet, called the Lacedemonian letter. (Hebrew, Yod [י] the smallest Hebrew letter.)
“This bond doth give thee here no jot of blood.”
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.