(Jimmy of the Clue Crew shows a plant diagram on the monitor.)  Similar to a root, it's the botanical term for a thick, horizontal underground stem from which shoots develop into new plants
.... We show that patterns in soil and groundwater salinity were caused 
by ...... development of the water resources for better plant growth, long-term as 
well... [DOC] [TLE] The Project Gutenberg EBook of Roget's ... - Parent Directory [PAR] The objective is to create a database of words organized by semantic categories, 
..... near, close, something like, sort of, in the ballpark, such like; a show of; mock, 
..... 306; subside; melt away, die away; retire into the shade, hide its diminished 
...... adultness &c.