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

• Lexulous
• Wordscraper
• Wordosaur

n. Plural form of fossa.

"Arsia Mons, he said, is home to the biggest mountain glacier on Mars now buried, but as much as three miles deep when snow was falling in ancient times, climate modelers have concluded, and the area is filled with hundreds of miles of deep fractures in the ground, or “fossae,” as such Martian features are called."

midgut    alae    insufflation    fornix    nasopharynx    fossa    cricoarytenoid    cannula    caterwauling    decongestant