Real Dictionary

ash
uncountable noun: Ash is the grey or black powdery substance that is left after something is burnt. You can also refer to this substance as ashes.

ash in American English 1
the white or grayish powder remaining after something has been thoroughly burned
noun: the powdery residue of matter that remains after burning

ash in American English 2
any of a genus (Fraxinus) of timber and shade trees of the olive family, having odd-pinnate leaves, winged fruit, and tough, springy wood
noun: any of various trees of the genus Fraxinus, of the olive family, esp. F. excelsior, of Europe and Asia, or F. americana (white ash), of North America, having opposite, pinnate leaves and purplish flowers in small clusters

ASH in British English
noun acronym for: Action on Smoking and Health

ash in British English 1
noun: the nonvolatile products and residue formed when matter is burnt

ash in British English 2
noun: any oleaceous tree of the genus Fraxinus, esp F. excelsior of Europe and Asia, having compound leaves, clusters of small greenish flowers, and winged seeds

ash in British English 3
noun: the digraph æ, as in Old English, representing a front vowel approximately like that of the a in Modern English hat. The character is also used to represent this sound in the International Phonetic Alphabet