DALTONISM, dal'ton-izm, _n._ colour-blindness: inability to distinguish
certain colours.--_adj._ DALT[=O]'NIAN. [So called from the chemist John
_Dalton_ (1766-1844), who had this infirmity.]
DAM, dam, _n._ an embankment to restrain water: the water thus
confined.--_v.t._ to keep back water by a bank:--_pr.p._ dam'ming; _pa.p._
dammed. [Teut.; Dut. _dam_, Ger. _damm_, &c.]