/thow"zeuhndth, -zeuhntth, -zeuhnth/ , adj.
1. last in order of a series of a thousand.
2. being one of a thousand equal parts.
n.
3. a thousandth part, esp. of one (1/1000).
4. the thousandth member of a series.
5. Also, thousandth's place . (in decimal notation) the position of the third digit to the right of the decimal point.
[ 1545-55; THOUSAND + -TH 2 ]