uš

1. louse
   Dete je donelo uši iz vrtića. — The kid brought lice home from kindergarten.
   U apoteci ima šampona protiv ušiju. — The pharmacy has anti-lice shampoo.

It is mostly used in the plural, uši (gen. ušiju). In everyday speech in Serbia the usual words are vaš or vaška (plural vaši, vaške); uš is the more literary variant.