What is "kidney ore"

Kidney \Kid"ney\ (k[i^]d"n[y^]), n.; pl. Kidneys (k[i^]d"n[i^]z). [OE. kidnei, kidnere, from Icel. koi[eth]r belly, womb (akin to Goth. gipus, AS. cwi[thorn] womb) + OE. nere kidney; akin to D. nier, G. niere, OHG. nioro, Icel. n[=y]ra, Dan. nyre, Sw. njure, and probably to Gr. nefro`s Cf. Kite belly.]

1. (Anat.) A glandular organ which excretes urea and other waste products from the animal body; a urinary gland.

   Note: In man and in other mammals there are two kidneys, one on each side of vertebral column in the back part of the abdomen, each kidney being connected with the bladder by a long tube, the ureter, through which the urine is constantly excreted into the bladder to be periodically discharged.

2. Habit; disposition; sort; kind; as, a man of a different kidney.
   --Shak.

   There are in later times other decrees, made by popes of another kidney.
   --Barrow.

   Millions in the world of this man's kidney.
   --L'Estrange.

   Your poets, spendthrifts, and other fools of that kidney, pretend, forsooth, to crack their jokes on prudence.
   --Burns.

   Note: This use of the word perhaps arose from the fact that the kidneys and the fat about them are an easy test of the condition of an animal as to fatness. ``Think of that, -- a man of my kidney; -- . . . as subject to heat as butter.''
   --Shak.

3. A waiter. [Old Cant]
   --Tatler.

   Floating kidney. See Wandering kidney, under Wandering.

   Kidney bean (Bot.), a sort of bean; -- so named from its shape. It is of the genus Phaseolus ( Phaseolus vulgaris). See under Bean.

   Kidney ore (Min.), a variety of hematite or iron sesquioxide, occurring in compact kidney-shaped masses.

   Kidney stone. (Min.) See Nephrite, and Jade.

   Kidney vetch (Bot.), a leguminous herb of Europe and Asia ( Anthyllis vulneraria), with cloverlike heads of red or yellow flowers, once used as a remedy for renal disorders, and also to stop the flow of blood from wounds; lady's-fingers.

n. hematite in reniform habit