عَجَاجٌ

Dust: (S, A, O, K:) or dust raised by the wind: (TA:) and smoke: (S, A, O, K:) ↓ عَجَاجَةٌ is a more special term [signifying a portion, or cloud, of dust: and of smoke]: (S, O:) and this latter signifies [also] a dust that buries in it everything; as also هَجَاجَةٌ. (TA.)

Also Low, vile, base, mean, or ignoble, people; (Sh, O, K, TA;) lacking intellect, or understanding; (Sh, O;) in whom is no good: [a coll. gen. n.; for] ↓ عَجَاجَةٌ signifies one of such persons [as is indicated in the O]. (TA.) And, applied to a single person, Foolish; stupid; unsound, or deficient, in intellect, or understanding. (K.)