Jigger \Jig"ger\ (j[i^]g"g[~e]r), n. [A corrupt. of chigre.]
1. (Zool.) A species of flea ({Tunga penetrans}, or
{Sarcopsylla penetrans}, or {Pulex penetrans}), which
burrows beneath the skin; called also {jigger flea}. See
{Chigoe}.
[1913 Webster]
2. (Zool.) Any one of several species of small red mites
(esp. {Tetranychus irritans} and {Tetranychus Americanus})
of the family {Trombiculidae}, which, in the larval or
leptus stage, burrow beneath the skin of man and various
animals, causing great annoyance. Also called {chigger}.
[Southern U. S.]
[Webster 1913 Suppl. +PJC]