a·yin (???n)n. The 16th letter of the Hebrew alphabet. See Table at alphabet.[Hebrew ‘ayin, eye, ayin; see ?yn in Semitic roots.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.ayin (???j?n; Hebrew ?aji?n) n (Letters of the Alphabet (Foreign)) the 16th letter in the Hebrew alphabet (?), originally a pharyngeal fricative, that is now silent and transliterated by a raised inverted comma (`)[Hebrew]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014a?yin (?? y?n, ?? yin) n. the 16th letter of the Hebrew alphabet. [1875?80;