Definitions for "Indumentum"
a covering of fine hairs (or sometimes scales) as on a leaf or insect
With a generally heavy covering of hair: a general term without precise connotation.
the epidermal appendages, e.g. hairs or scales, collectively.
A wooly or hairy covering of leaves or young shoots. Can be on both top and bottom surfaces of new or young leaves, but is usually confined to the underside of mature leaves.