conjoined twins

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con·joined twins

monozygotic twins with varying extent of union and different degrees of residual duplication. The various types of union are named by the use of a prefix designating the region that is united and adding the suffix -pagus, meaning joined (for example, craniopagus [united by the heads], thoracopagus [united in thoracic region]); the various types of residual duplication are named by designating the parts duplicated and adding the suffix -didymus, or -dymus, meaning twin (for example, cephalodidymus, cephalodymus).
Farlex Partner Medical Dictionary © Farlex 2012

con·joined twins

(kon-joynd' twinz)
Monozygotic twins with varying extent of union and different degrees of residual duplication. The various types of union are named by the use of a prefix designating the region that is united and adding the suffix -pagus, meaning fused (e.g., craniopagus, thoracopagus); the various types of residual duplication are named by designating the parts duplicated and adding the suffix -didymus, or -dymus, meaning twin (e.g., cephalodidymus, cephalodymus).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The present conjoint twin is a rare case in which the baby had two normal heads with two necks.
This is the first report of MCA-PSV in conjoint twins. Moreover even in MC or DC twins no significant correlation has been yet demonstrated between the inter-twin MCA PSV difference and discordance in MC or DC twin gestations.
Conjoint twins which are inseparable from each other.