indumentum

noun, plural in·du·men·ta [in-doo–men-tuh, -dyoo-] /ˌɪn dʊˈmɛn tə, -dyʊ-/, in·du·men·tums. Botany, Zoology.

1. a dense, hairy covering.

noun plural -ta (-tə) or -tums

1. an outer covering, such as hairs or down on a plant or leaf, feathers, fur, etc