middle thread
middle thread. The center line of something; esp. an imaginary line drawn lengthwise through the middle of a stream’s current.
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middle line of main channel
middle line of main channel. The equidistant point in the main channel of the river between the well-defined banks on either shore; the middle thread of a river’s current. — Also termed mid-channel; middle of the river.
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ad filum aquae
ad filum aquae (ad fI-l[schwa]m ak-wee), adv. [Law Latin] To the thread of the water; to the central line or middle of a stream. • This refers to the ownership reach of a riparian proprietor. — Also termed ad medium filum aquae.
filum
filum (fI-l[schwa]m). [Latin “thread”] Hist. 1. A thread or wire that holds (esp. legal) papers together to form a file. • This was the ancient method of filing legal papers. 2. An imaginary thread or line passing through the middle of a stream or road. — Also termed (in sense 1) filacium. filum aquae (fI-l[schwa]m