Half_shade

Half-shade [ Horticulture ]	Dictionary of botanic terminology - index of names
Synonym: Semi-shade, Partial shade, Light shade, Light sun, Partial sun

An environment that receives between 2-4 hours of direct sunlight.

"Partial shade" (Also "light shade" or "half shade") is an environment that receive less then a half day of direct sunlight or a filtered sunlight situation such as beneath a canopy of shade trees in summer.
Partial shade is indicated for plant species which require protection from prolonged hot sun, but which will tolerate some degree of full summer sun . Often these species prefer morning sun and afternoon shade.

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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