"blinder" in the noun sense
1. winker, blinker, blinder
blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side
"blinder" in the adjective sense
1. blind, unsighted
unable to see
"a person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision"
unable or unwilling to perceive or understand
"blind to a lover's faults"
"blind to the consequences of their actions"
3. blind, unreasoning
not based on reason or evidence
Source: WordNet® (An amazing lexical database of English)
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