tomentum
Concise Oxford English Dictionary © 2008 Oxford University Press:
tomentum /təˈmɛntəm/
▶noun (pl. tomenta /-tə/) Botany a layer of matted woolly down on the surface of a plant.
– derivatives
tomentose /təˈmɛntəʊs, ˈtəʊ-/ adjective,
tomentous adjective.
tomentose /təˈmɛntəʊs, ˈtəʊ-/ adjective,
tomentous adjective.
– origin C17: from L., lit. ‘cushion stuffing’.
'tomentum' also found in these Oxford entries:

