[f. AMELIORATE + -OR, after L. analogies; cf. arbitrator.] He who, or that which, ameliorates.
1865. Buckman, Sc. in Farm Cult., xi. 74. The admixture of manures or ameliorators, such as guano.
1872. Yeats, Growth & Viciss. Comm., 272. The ameliorator of agricultural distress was François.
1877. Sir C. W. Thomson, Voy. Challenger, I. ii. 121. They [shells] are drifted along and scattered about by our beneficent ameliorator, the Gulf-stream.
