ouabaion.

1856 R. F. Burton First Footsteps in E. Afr. vi. 198 This is the celebrated Waba, which produces the Somali Wabayo, a poison applied to darts and arrows.

1890 J. S. Billings National Med. Dict. II. 270/1 Ouabaio, an arrow-poison used by the Somalis on the east coast of Africa, derived from a species of Carissa.

1893 Pharmaceut. Jrnl. & Trans. 27 May 965 In the year 1882 some roots, stems, and leaves of the plant said to yield the ouabaio poison of the Somalis were sent from Africa to France by M. Revoil.

1909 Jrnl. Royal Afr. Soc. 9 67 Commander Gaunt was forced to retreat, having..lost one man—John Stanton, a marine, killed by an arrow poisoned with wabayo.

1888 Jrnl. Chem. Soc. 54 848 The Comalis [sic] on the East Coast of Africa prepare an arrow-poison from the aqueous extract of the wood, and especially of the root of the Ouabaïo, a tree which is closely related to although not identical with Carissa schimperii, a native of Abyssinia.

1893 E. H. Squibb et al. Ephemeris IV. 45 Ouabaïn is a glucoside obtained by extraction from the root and wood of the Ouabaïo.

1910 W. Martindale & W. W. Westcott Extra Pharmacopœia (ed. 14) 651 Ouabain... A glucoside from Ouabaio wood, obtained from a Carissa sp. of the same natural order as strophanthus.

1938 Thorpe's Dict. Appl. Chem. (ed. 4) II. 386/1 Arnaud..obtained from the seeds [of Strophanthus gratus] the crystalline glucoside ouabain, which he first discovered in the roots and bark of the ouabaio tree (Acokanthera Ouabaïo) of East Africa.

2000 Columbia Encycl. (ed. 6) 13509 Common preparations include digitalis, digitoxin, and digoxin, all from foxglove, and ouabain from Strophanthus gratus, the ouabaio tree.