This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. superlative form of spongy: most spongy.

"When a church supper was toward, she was always called upon for her wonderful mayonnaise dressing, or her angel-food cake, —sure to be the lightest and spongiest in any assemblage of cakes."