di-, dicho-, dich-

(Greek: number two; twice, divided, double; unalike; a number used as a prefix)

dichotic
Involving or relating to the simultaneous stimulation of each ear with different sounds.
dichotomy (s) (noun), dichotomies (pl)
A division into two usually contradictory parts or opinions: Shirley's essay discusses the dichotomy between good and evil as presented in an author's novel that she had been reading.

Tim's psychologist discussed the dichotomy of love and hate when associating with people.

A division into two equal parts.
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dichroism
dichromatic
dichromatic vision (s) (noun), dichromatic visions (pl)
A form of color vision in which only two special hues, or two of the three primary colors, can be seen.
dichromatism
dichromatopsia, dichromatism
The condition, or state, of being dichromatic or exhibiting two colors.
dichromic
dichromophil
dichromophilism
dicrotism
A condition in which there are two beats or waves of the arterial pulse to each beat of the heart.
dicyclic
dicynodont
1. A fossil reptile characterized by the absence of all teeth except for two long canines in the upper jaw.
2. Anything, or anyone, having the same characteristics.
didactyl
An animal having only two digits.
didactylism
1. The presence of only two digits on a hand or foot.
2. Congenital condition (at birth) of having two fingers on a hand or two toes on a foot.