Naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter

Wikipedia Word definitions in Wikipedia
Acrophony (; Greek: ἄκρος akros uppermost + φωνή phone sound) is the naming of letters of an alphabetic writing system so that a letter's name begins with the letter itself. For example, Greek letter names are acrophonic: the names of the letters α, β, ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Acrophony \A*croph"o*ny\, n. [Gr. 'a`kros extreme + ? sound.] The use of a picture symbol of an object to represent phonetically the initial sound of the name of the object. [1913 Webster] ||

Wiktionary Word definitions in Wiktionary
n. Naming letters in an alphabetic writing system using words whose initial sounds are represented by the respective letters.

WordNet Word definitions in WordNet
n. naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter