What is the meaning of Ith?

Occurring at position i in a sequence.

The letter ⟨(⟩, which stands for the th sound (/θ/) in Pitman shorthand.

behind

to follow someone

ground warmth

body warmth, fervor

to eat

alternative form of ioth (“corn, grain”)

corn, grain

second-person singular imperative of ithid

eat

(not in science) particle, atom, a grain

grain, corn.

Source: wiktionary.org