See speck in Webster's New World Roget's A-Z Thesaurus II
A very small mark:
dash, dot, fleck, pinpoint, point, spot. See marksA tiny amount:
bit1, crumb, dab1, dash, dot, dram, drop, fragment, grain, iota, jot, minim, mite, modicum, molecule, ort, ounce, particle, scrap1, scruple, shred, smidgen, tittle, trifle, whit. (Chiefly British) spot. See bigLearn more about speck