An agent, such as an analgesic drug, that relieves pain.

镇痛剂一种药剂，如止痛药，减轻疼痛。

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I believe we've found the main mechanism by which acupuncture relieves pain.

我相信我们已经找出了为何针灸能够止痛的主要机理。

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Something, such as medicine or therapy, that relieves pain, cures disease, or corrects a disorder.

药物；治疗：减轻痛苦，治疗疾病或者排除混乱的东西，诸如药品或者治疗。

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Its fans will tell you that it relieves a variety of ills--from asthma, hay fever and sinus infections to chronic pain, arthritis, inflammation and migraine.

FORBES: Magazine Article