Hairlike

Hairy [ Botany ]	Dictionary of botanic terminology - index of names
Synonym: Hairlike, Filiform, Capillary, Bristle-like, Cirrose, Fibrous, Hirsute, Flagelliform, Funicular, Threadlike

Of a plant part or organ resembling a hair in the manner of growth; long and slender like a hair.

Example of hair-like organ are:

Trichomes: Hair-like outgrowths from the epidermis.
Flagellum: Long, hair-like structure specialized for movement of cells of many living organisms.
Setae: Hair-like extensions of the leaf.
Root hairs: Extensions of epidermal cell of roots which assists with absorption of nutrients.
Bristles: Hair-like structure.
Pubescences: Any type of hair-like structure on a plant part.
Rhizoid: hair-like filamentous anchorage/absorbing organ.
Etc…

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994