the sour taste that causes a painful feeling in the jaw where the tooth is or teeth are damaged.

the citrus tree Citrus medica of Rutaceae family; lemon tree.

its small, egg-shaped, edible frit with a pale-yellow rind and a juicy, sour pulp; lemon.

the tree Feronia limonia (= f. elephantum) of Rutaceae family.

its hard-shelled edible fruit; wood apple.

the small, short weed Oxalis corniculata (= O. pusilla, = Xanthoxalis corniculata) of Oxalidaceae family, with sour, edible leaves; wood sorrel.