/ Dictionary / Index A anencephaly: Meaning and Definition of Find definitions for: an•en•ceph•a•ly Pronunciation: (an"en-sef'u-lē), [key] — n. Med. congenital absence of part or all of the brain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: anencephaly (Thesaurus) anemotropism anenst Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language