Having exactly two spots, marks, or stains.
From Latin 'bi-' (two) and 'macula' (spot or stain), with the suffix '-ate' forming an adjective; first appearing in English in scientific or naturalistic contexts to describe markings on plants or animals.
Scientists used hyper-specific adjectives like 'bimaculate' to create a universal language for describing nature—if you said 'two spots,' different observers might count differently, but 'bimaculate' meant the same thing everywhere.
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