• The fusion of two embryos to form conjoined twins
  • (medicine) An alien form of life within an organism, commonly invasive, such as a growing cancer.
  • (physiology) The (natural or surgical) union of parts of two organisms, especially in such a way as to cause them to share their vascular systems). Organisms so joined then are called parabionts)
  • (ecology) (ethology) A form of symbiosis, typically among ants, in which different species share common nest galleries but maintain distinct broods and do not practice mutualism other than incidentally.
  • A transient physiological state of suspension of obvious vital activities such as to enable an organism to escape the notice of its enemies or to conserve its energy.

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