taproot
tap·root
noun
Origin
From tap + root. The oldest use (by Philemon Holland) is spaced as tap root. In the 18th and 19th centuries the standard spelling was tap-root.
Related words
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.