Medical Dictionary


noun \ˈärch\

Medical Definition of ARCH

:  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
:  a fingerprint in which all the ridges run from side to side and make no backward turn

Illustration of ARCH

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