4. (Telegraphy) A wire forming part of a main circuit and returning to
the point from which it starts.
5. (Acoustics) The portion of a vibrating string, air column, etc.,
between two nodes; -- called also ventral segment.
Loop knot, a single knot tied in a doubled cord, etc. so as to leave a
loop beyond the knot. See Illust. of Knot.
Loop (lp), v. t. [imp. & p. p. Looped (lpt); p. pr. & vb. n. Looping.]
To make a loop of or in; to fasten with a loop or loops; -- often with
up; as, to loop a string; to loop up a curtain.
Looped (lpt), a. 1. Bent, folded, or tied, so as to make a loop; as, a
looped wire or string.