[proh-tuh-steel, -stee-lee]
noun Botany.
the solid stele of most roots, having a central core of xylem enclosed by phloem.

1900–05; proto- + stele

protostelic [proh-tuh-stee-lik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
protostele (ˈprəʊtəˌstiːl, -ˌstiːlɪ)
a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
protostele   (prō'tə-stēl', prō'tə-stē'lē)  Pronunciation Key 
The most primitive form of stele, consisting of a solid core of xylem encased by phloem or of xylem interspersed with phloem. The roots of all vascular plants, as well as the stems of lycophytes, have protosteles.
The American Heritage® Science Dictionary
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