haplography

[hap-log-ruh-fee]
noun
  1. the accidental omission of a letter or letter group that should be repeated in writing, as in Missippi for Mississippi.
Compare dittography.

Origin of haplography

First recorded in 1885–90; haplo- + -graphy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for haplography

haplography

noun plural -phies
  1. the accidental writing of only one letter or syllable where there should be two similar letters or syllables, as in spelling endodontics as endontics

Word Origin for haplography

C19: from Greek, from haplous single + -graphy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for haplography
n.

scribal error of writing only once a letter that should have been written twice; see haplo- + -graphy.

Online Etymology Dictionary, © 2010 Douglas Harper