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Related to double pregnancy: superfetation
See: alter ego, copy, correlate, counterpart, duplicate, image, parallel, reflection, reproduce, resemblance, same, substitute

DOUBLE. Twofold; as, double cost; double insurance; double plea.

References in periodicals archive ?
6 Try popping a multivitamin Research at the Royal Free Hospital, London, showed taking a daily prenatal vitamin - containing key nutrients for conception like folic acid, vitamin B12 and selenium - could more than double pregnancy chances.
The double pregnancy is natural and not the result of any IVF treatment.