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acral (not comparable) Of or pertaining to peripheral body parts, such as toes and fingers. Acral melanoma is a type of skin cancer that occurs on fingers, palms, soles, and nail beds. Acral distribution of a dermatosis means it affects distal portions of limbs (hand, foot) and head (ears, nose).
Conversely, an achiral object, such as an atom, is symmetric; its mirror image is not truly opposite, but rather is indistinguishable from the original. In chemistry, chirality usually refers to molecules. Two mirror images of a chiral molecule are called enantiomers or optical isomers.airs of enantiomers are often designated as  right-  and left-handed. Molecular chirality is of interest because of its application to stereochemistry in inorganic chemistry, organic chemistry, physical chemistry, biochemistry, and supramolecular chemistry.