The spelling of the word "icing heart" is straightforward. "Icing" is spelled with the letters "i-c-i-n-g," representing the phonemes /aɪ sɪ ŋ/. This word is used to describe a sweet, often decorative, topping used on desserts. "Heart" is spelled with the letters "h-e-a-r-t," representing the phonemes /h ɑrt/. This word refers to the organ that circulates blood or a symbol used to represent love or affection. Together, "icing heart" describes a dessert with a decorative, heart-shaped topping.
Pericarditis in which the heart is seen post mortem covered with a thick, white coat like the icing of cake.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The term "icing heart" does not have an established etymology as it is not a commonly used or recognized phrase. It appears to be a combination of two separate words, "icing" and "heart", but without a specific context or usage, it is difficult to determine any specific origin or meaning of this phrase.