excalation

excalation
Absence, suppression, or failure of development of one of a series of structures, as of a digit or vertebra. [G. ex, from, + chalao, to abate, release]

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ex·ca·la·tion (eks″kə-laґshən) absence or exclusion of one member of a normal series, such as a vertebra.

Medical dictionary. 2011.

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