The phrase "almost bisected" is correct and usable in written English.
It can be used to describe something that has been nearly divided into two equal parts, but not completely.
Example: "The tree was almost bisected by the powerful storm, leaving it precariously standing."
Alternatives: "nearly divided" or "partially split".
It is 27 miles (43 km) long, 2 8 miles (3 13 km) wide, and almost bisected by Loch Tarbert (a sea loch).
Almost bisected by a gully and busily dotted with trees, a neat dark row of them on the horizon, the rectangle is surrounded on three sides by blandly bleak open fields.
Had Conan Doyle been able to consult with the writers of "Sherlock Holmes," the new movie directed by Guy Ritchie, he might have devised, as they did, more vengeful and imaginative perils, like having Holmes almost bisected by a buzz saw in an abattoir, or crushed by a runaway hull in a shipyard.
The Medina almost bisects the island, and the Western Yar almost insulates the western Wight.
Visit the historic fort at Louisbourg and take a boat tour of Bras d'Or Lake, the saltwater lake that almost bisects the island.
Backed by densely wooded mountains, it is situated on an inlet that deeply indents the southeast shore of Tutuila Island, almost bisecting the island while forming an extensive naturally protected deepwater harbour.
Construction of Israeli homes, hotels and businesses in the area would make it almost impossible for East Jerusalem to become the capital of Palestine under a future agreement, and would almost bisect the West Bank.
I made my way back along the Via dell'Abbondanza to the Via Stabiana, which almost bisects the city north-south, and out another gate, Porta Vesuvio, on the north side.
The Iganga District is very rural and one of the poorest for the amount of access to health the populous should have; the main artery road from Nairobi to Kampala almost bisects the district.
The island had been nearly bisected here by water.
The low-lying Meratus Mountains run in a north-south arc that almost bisects the province; on its southern fringe is the Kusan mountain range.
