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arch

n 1  :  an anatomical structure that resembles an arch in form or function: as  a  :  either of two vaulted portions of the bony structure of the foot that impart elasticity to it: (1)  :  a longitudinal arch supported posteriorly by the basal tuberosity of the calcaneus and anteriorly by the heads of the metatarsal bones (2)  :  a transverse arch consisting of the metatarsals and first row of tarsals and resulting from elevation of the central anterior portion of the median longitudinal arch  b  :  ARCH OF THE AORTA  2  :  a fingerprint in which all the ridges run from side to side and make no backward turn .
 
 

 
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