| protandric | <zoology> Having male sexual organs while young, and female organs later in life. Protan"trism. Origin: Proto- + Gr, a man. Source: Websters Dictionary (01 Mar 1998) |
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| protandrous | Having the male sex organs maturing before the female, of a flower, shedding the pollen before the stigma is receptive. Compare: protogynous. (09 Oct 1997) |
| protanomaly | A deficiency of colour perception in which the red-sensitive pigment in cones is decreased. Origin: G. Protos, first, + anomalia, anomaly (05 Mar 2000) |
| protanopia | A form of dichromatism characterised by absence of the red-sensitive pigment in cones, decreased luminosity for long wavelengths of light, and confusion in recognition of red and green. Origin: G. Protos, first, + a-priv. + ops (op-) eye (05 Mar 2000) |