Having been shaped or formed into two distinct parts or structures; existing with two separate forms.
From 'biform' + '-ed' suffix. This is the past participle or adjectival form emphasizing that something has two forms.
Butterflies are perhaps nature's most dramatic example of biformed creatures—they live half their life as a caterpillar and half as a winged insect, complete transformations that fooled people for centuries about what they actually were.
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