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Use "fossae" in a sentence
"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."
"A recently taken high resolution stereo camera picture shows the Mangala fossae trough, which is a system of outflow channels on Mars."
"Perhaps the most remarkable thing about sauropod vertebrae is how pneumatic they were – the lateral fossae, and the interior of the vertebrae, were occupied, in life, by air sacs."