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Leucoplastid
- One of certain very minute whitish or colorless granules occurring in the protoplasm of plants and supposed to be the nuclei around which starch granules will form.
 
Leucopyrite
- A mineral of a color between white and steel-gray, with a metallic luster, and consisting chiefly of arsenic and iron.
 
Leucorrhoea
- A discharge of a white, yellowish, or greenish, viscid mucus, resulting from inflammation or irritation of the membrane lining the genital organs of the female; the whites.
 
Leucoryx
- A large antelope of North Africa (Oryx leucoryx), allied to the gemsbok.
 
Leucoscope
- An instrument, devised by Professor Helmholtz, for testing the color perception of the eye, or for comparing different lights, as to their constituent colors or their relative whiteness.
 
Leucosoid
- Like or pertaining to the Leucosoidea, a tribe of marine crabs including the box crab or Calappa.
 
Leucoturic
- Pertaining to, or designating, a nitrogenous organic substance of the uric acid group, called leucoturic acid or oxalantin. See Oxalantin.
 
Leucous
- White; -- applied to albinos, from the whiteness of their skin and hair.
 
Leucoxene
- A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron.