Lexical Definition

‎נִדָּה‎ niddâh (nid-daw') impurity ^H:N-F
from ‎נָדַד‎

[idiom] far, filthiness, [idiom] flowers, menstruous (woman), put apart, [idiom] removed (woman), separation, set apart, unclean(-ness, thing, with filthiness).

• properly, rejection
• by implication, impurity, especially personal (menstruation) or moral (idolatry, incest)

1) impurity, filthiness, menstruous, set apart
1a) impurity
1a1) of ceremonial impurity
1a2) of menstruation
1b) impure thing (fig.)
1b1) of idolatry, immorality

See Greek: ἁγνισμός · ἀκαθαρσία · μετακινέω · ῥαντισμός

Brown-Driver-Briggs

‎נִדָּה‎ noun feminine impurity (as abhorrent, shunned); — absolute ‎׳‎‎נ‎ Ezek 18:6 +; construct ‎נִדַּת‎ Lev 12:2 +; suffix ‎נִדָּתָהּ‎ vLev 12:5 +; — impurity (especially P and Ezekiel):

1. of ceremonial impurity, as union with brother's wife, Lev 20:21 especially of menstruation Ezek 18:6 (read ‎אִשָּׁה בְּנִדָּתָהּ‎ for ᵑ0 ‎נִדָּה‎ ‎׳‎‎א‎ ᵑ6 Co), ‎׳‎‎טְמֵאַת הַנּ‎ Ezek 22:10, compare Ezek 36:17, ‎נִדַּת דְּוֺתָהּ‎ Lev 12:2, compare vLev 12:5; Lev 15:19; Lev 15:20; Lev 15:24; Lev 15:25 (‎׳‎‎עֶתנִֿדּ‎), (3 t. in verse), vLev 15:26 (‎׳‎‎מִשְׁכַּב נִדּ‎), vLev 15:26 (‎׳‎‎טֻמְאַת נִדּ‎), vLev 15:33; Lev 18:19 of defilement contracted by contact with a corpse, ‎מֵי (הַ)נִּדָּה‎ water of impurity (i.e. to remove it, compare Di) Num 19:9; Num 19:13; Num 19:20; Num 19:21 (twice in verse); Num 31:23.

2. figurative (with allusion to cerem. usage), impure thing, Ezek 7:19; Ezek 7:20 (of gold), Lam 1:17 (of Jerusalem); of idolatry, immorality, etc., 2Chr 29:5; Ezra 9:11 (‎אֶרֶץ נִדָּה‎), vEzra 9:11, Zech 13:1 (‎לְחַטַּאת וּלְנִדָּה‎).

Brown-Driver-Briggs References