Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

arch

play
noun \ˈärch\

Medical Definition of arch

  1. 1:  an anatomical structure that resembles an arch in form or function: asa:  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 archb:  arch of the aorta

  2. 2:  a fingerprint in which all the ridges run from side to side and make no backward turn



Illustration of arch



Seen and Heard

What made you want to look up arch? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a division or portion of a pool or whole

Get Word of the Day daily email!