Etymology : Middle English leche, from Old English l[AE]ce; akin to Old High German lAhhi physician
Pronunciation : 'lEch
Function : noun
Date : before 12th century
1. In computing and specifically on the Internet, being a leech or leecher refers to the practice of benefiting, usually deliberately, from others' information or effort but not offering anything in return, or only token offerings in an attempt to avoid being called a leech. In economics this type of behaviour is called "Free riding" and is associated with the Free rider problem.
2. bloodsucking worm; person who clings to another without giving anything in return, parasite; doctor, physician (Archaic). cling to, stick to like a leech; draw blood using leeches. leech\leech\ (lēch), n. see:
2d leach.leech \leech\, v. t. see:
leach, v. t.leech \leech\, n. [cf. lg. leik, icel. līk, sw. lik boltrope, st?ende liken the leeches.] (naut.) the border or edge at the side of a sail. [written also leach.]leech line, a line attached to the leech ropes of sails, passing up through blocks on the yards, to haul the leeches by.leech rope, that part of the boltrope to which the side of a sail is sewed.leech \leech\, n. [oe. leche, l?che, physician, as. l&aemacr;ce; akin to fries. lētza, ohg. lāhhī, icel. l?knari, sw. l?kare, dan. l?ge, goth. lēkeis, as. lācnian to heal, sw. l?ka, dan. l?ge, icel. l?kna, goth. lēkinōn.].
3. a physician or surgeon; a professor of the art of healing. [written also leach.] [archaic] leech, heal thyself. (luke iv. 23).
4. (zo?l.) any one of numerous genera and species of annulose worms, belonging to the order hirudinea, or bdelloidea, esp. those species used in medicine, as hirudo medicinalis of europe, and allied species.note: in the mouth of bloodsucking leeches are three convergent, serrated jaws, moved by strong muscles. by the motion of these jaws a stellate incision is made in the skin, through which the leech sucks blood till it is gorged, and then drops off. the stomach has large pouches on each side to hold the blood. the common large bloodsucking leech of america (macrobdella decora) is dark olive above, and red below, with black spots. many kinds of leeches are parasitic on fishes; others feed upon worms and mollusks, and have no jaws for drawing blood. see:
bdelloidea. hirudinea, and clepsine.
5. (surg.) a glass tube of peculiar construction, adapted for drawing blood from a scarified part by means of a vacuum.
6. See 2d Leach.
7. See Leach, v. t.
8. The border or edge at the side of a sail.
9. A physician or surgeon; a professor of the art of healing.
10. Any one of numerous genera and species of annulose worms, belonging to the order Hirudinea, or Bdelloidea, esp. those species used in medicine, as Hirudo medicinalis of Europe, and allied species.
11. A glass tube of peculiar construction, adapted for drawing blood from a scarified part by means of a vacuum.
12. To treat as a surgeon; to doctor; as, to leech wounds.
13. To bleed by the use of leeches. carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end a follower who hangs around a host in hope of gain or advantage.
14. 1. A leech is a small animal which looks like a worm and lives in water. Leeches feed by attaching themselves to other animals and sucking their blood.
15. disapproval If you describe someone as a leech, you disapprove of them because they deliberately depend on other people, often making money out of them. They're just a bunch of leeches cadging off others!. Any annelid worm of the class Hirudinea (about 300 known species), with a small sucker containing the mouth at the front end and a large sucker at the back end. Species range from tiny to about 8 in. (20 cm) long. Leeches live primarily in freshwater or on land. Some species are predators, some eat organic debris, and others are parasitic. Aquatic leeches may feed on the blood of fishes, amphibians, birds, and mammals, or they may eat snails, insect larvae, and worms. True land leeches feed only on the blood of mammals. Substances in the leech's saliva anesthetize the wound area, dilate the blood vessels, and prevent the blood from clotting. For centuries, some species have been used to drain off blood. Hirudin, extracted from the European medicinal leech, is used medically as an anticoagulant.