(a) Obedient; willing to serve someone; also, willing to fulfill an obligation; ~ to, ~ unto; (b) as noun: obedient person; (c) ~ to (unto), subject to the rule of (sb. or sth.), subjected to; in servitude to (a vice).

(a) Med. & anat. Of an organ, limb, bodily tissue or fluid, etc.: capable of responding to a bodily process, a stimulus, or a medical treatment; responsive; flexible; of a disease or wound: responsive to a treatment; of a type of food: amenable to digestion; (b) phys. & astron. of matter, an element, a star or sign of the zodiac, a natural force, an object, etc.: subject or responsive to some force or influence; readily moved (to do sth.); ready or willing (to be acted upon).