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echard

American  
[ek-hahrd] / ˈɛkˌhɑrd /

noun

  1. the water in soil that is not available for absorption by plants.


echard British  
/ ˈɛkɑːd /

noun

  1. water that is present in the soil but cannot be absorbed or otherwise utilized by plants

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of echard

First recorded in 1905–10; from ech-, root of Greek verb échein “to have, hold, hold back” + árd(ein) “to water, irrigate”; chresard ( def. )