BUTTONWOOD n.
The Platanus occidentalis, or American plane tree, a large tree, producing rough balls, from which it is named; -- called also buttonball tree, and, in some parts of the United States, sycamore. The California buttonwood is P. racemosa.
CACODYLIC a.
Of, pertaining to, or derived from, cacodyl. Cacodylic acid, a white, crystalline, deliquescent substance, (CH3)2AsO.OH, obtained by the oxidation of cacodyl, and having the properties of an exceedingly stable acid; -- also called alkargen.