root hair

English Thesaurus

1. thin hairlike outgrowth of an epidermal cell just behind the tip; absorbs nutrients from the soil (noun.plant)

hypernym	:	plant organ,
definition	:	a functional and structural unit of a plant or fungus (noun.plant)

part meronym	:	root,
definition	:	(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground (noun.plant)