/nuyn"teenth"/ , adj.
1. next after the eighteenth; being the ordinal number for 19.
2. being one of 19 equal parts.
n.
3. a nineteenth part, esp. of one ( 1 / 19 ).
4. the nineteenth member of a series.
[ bef. 900; ME nyntenthe (see NINETEEN, -TH 2 ); r. nientethe, OE nigonteotha; see NINE, TITHE ]