Definition of needle

• n. - A small instrument of steel, sharply pointed at one end, with an eye to receive a thread, -- used in sewing.
• n. - See Magnetic needle, under Magnetic.
• n. - A slender rod or wire used in knitting; a knitting needle; also, a hooked instrument which carries the thread or twine, and by means of which knots or loops are formed in the process of netting, knitting, or crocheting.
• n. - One of the needle-shaped secondary leaves of pine trees. See Pinus.
• n. - Any slender, pointed object, like a needle, as a pointed crystal, a sharp pinnacle of rock, an obelisk, etc.
• v. t. - To form in the shape of a needle; as, to needle crystals.
• v. i. - To form needles; to crystallize in the form of needles.