(humorous, euphemistic) Synonym of not the sharpest knife in the drawer

(mineralogy) A triclinic-pinacoidal mineral containing calcium, hydrogen, iron, manganese, oxygen, and phosphorus.

(idiomatic) One or more people who make negative comments, which are usually unsolicited and unwanted, concerning the correctness of someone's English usage.

(US) A fragrant shrub with bluish flowers, Hyptis emoryi or Condea emoryi, native to the deserts of southwestern North America.