What do a.m. and p.m. stand for?

fraternal twin

one of a pair of twins, not necessarily resembling each other, or of the same sex, that develop from two separately fertilized ova.
Compare identical twin.
Origin of fraternal twin
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for fraternal twin
  • For example, compare identical twin correlations on a trait with fraternal twin correlations.
  • He is a stockholder in a company known to cognoscenti in the hearing room as a fraternal twin of the intelligence establishment.
  • Twin ovulations are the first prerequisite for fraternal twin births.
  • In one of these cases, a sample of the fraternal twin's hair was present in the known pool and was correctly eliminated.
Contemporary definitions for fraternal twin

nonidentical twins who developed from two separate fertilized eggs; also called dizygotic twin's 21st Century Lexicon
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