fourth

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fourth

(fôrth)
adj.
1. Coming after third, as in order, place, rank, time, or quality.
2. Being the digit that is next to and on the outermost side of the third digit, as on a foot.

fourth n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.