plummetn.[OE. plommet, OF. plommet, fr. plom, plum, lead, F. plomb. See Plumb.]1. A piece of lead attached to a line, used in sounding the depth of water.()I'll sink him deeper than e'er plummet sounded. (Shak.)2. A plumb bob or a plumb line. See under Plumb, n.()3. Hence, any weight.()4. A piece of lead formerly used by school children to rule paper for writing.()Plummet line, a line with a plummet; a sounding line.()