giant foxtail: two species of coarse annual foxtails that are naturalized weeds in United States
foxtail: grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes
sodium: a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)