excalation

Absence, suppression, or failure of development of one of a series of structures, as of a digit or vertebra. ... Origin: G. Ex, from, + chalao, to abate, release ... (05 Mar 2000) ...
Found on http://www.encyclo.co.uk/local/20973

excalation

Type: Term Pronunciation: eks′kă-lā′shŭn Definitions: 1. Absence, suppression, or failure of development of one of a series of structures, as of a digit or vertebra.
Found on http://www.medilexicon.com/medicaldictionary.php?t=30855

excalation

omission of one of a series or sequence
Found on http://phrontistery.info/e.html
No exact match found