Whit, n.
Etymology: [OE. wight, wiht, AS. wiht a creature, a thing. See Wight, and cf. Aught, Naught.]
The smallest part or particle imaginable; a bit; a jot; an iota; -- generally used in an adverbial phrase in a negative sentence. "Samuel told him every whit." 1 Sam. iii. 18. "Every whit as great." South. So shall I no whit be behind in duty. Shak. It does not me a whit displease. Cowley.
Shades of meaning
Fernald has no entry of its own for whit; he lists it under particle.
He lists it without comment; the entries above explain its neighbors.