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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Louse n.; pl. Lice   Zool.
 1. Any one of numerous species of small, wingless, suctorial, parasitic insects belonging to a tribe (Pediculina), now usually regarded as degraded Hemiptera. To this group belong of the lice of man and other mammals; as, the head louse of man (Pediculus capitis), the body louse (Pediculus vestimenti), and the crab louse (Phthirius pubis), and many others. See Crab louse, Dog louse, Cattle louse, etc., under Crab, Dog, etc.
 2. Any one of numerous small mandibulate insects, mostly parasitic on birds, and feeding on the feathers. They are known as Mallophaga, or bird lice, though some occur on the hair of mammals. They are usually regarded as degraded Pseudoneuroptera. See Mallophaga.
 3. Any one of the numerous species of aphids, or plant lice. See Aphid.
 4. Any small crustacean parasitic on fishes. See Branchiura, and Ichthvophthira.
 Note:The term is also applied to various other parasites; as, the whale louse, beelouse, horse louse.
 Louse fly Zool., a parasitic dipterous insect of the group Pupipara. Some of them are wingless, as the bee louse.
 Louse mite Zool., any one of numerous species of mites which infest mammals and birds, clinging to the hair and feathers like lice. They belong to Myobia, Dermaleichus, Mycoptes, and several other genera.

From: Webster's Revised Unabridged Dictionary (1913)

 Dog n.
 1. Zool. A quadruped of the genus Canis, esp. the domestic dog (Canis familiaris).
 Note: The dog is distinguished above all others of the inferior animals for intelligence, docility, and attachment to man. There are numerous carefully bred varieties, as the akita, beagle, bloodhound, bulldog, coachdog, collie, Danish dog, foxhound, greyhound, mastiff, pointer, poodle, St. Bernard, setter, spaniel, spitz, terrier, German shepherd, pit bull, Chihuahua, etc.  There are also many mixed breeds, and partially domesticated varieties, as well as wild dogs, like the dingo and dhole. (See these names in the Vocabulary.)
 2. A mean, worthless fellow; a wretch.
    What is thy servant, which is but a dog, that he should do this great thing?   -- 2 Kings viii. 13 (Rev. Ver. )
 3. A fellow; -- used humorously or contemptuously; as, a sly dog; a lazy dog. [Colloq.]
 4. Astron. One of the two constellations, Canis Major and Canis Minor, or the Greater Dog and the Lesser Dog. Canis Major contains the Dog Star (Sirius).
 5. An iron for holding wood in a fireplace; a firedog; an andiron.
 6. Mech. (a) A grappling iron, with a claw or claws, for fastening into wood or other heavy articles, for the purpose of raising or moving them. (b) An iron with fangs fastening a log in a saw pit, or on the carriage of a sawmill. (c) A piece in machinery acting as a catch or clutch; especially, the carrier of a lathe, also, an adjustable stop to change motion, as in a machine tool.
 Note:Dog is used adjectively or in composition, commonly in the sense of relating to, or characteristic of, a dog. It is also used to denote a male; as, dog fox or g-fox, a male fox; dog otter or dog-otter, dog wolf, etc.; -- also to denote a thing of cheap or mean quality; as, dog Latin.
 A dead dog, a thing of no use or value. --1 Sam. xxiv. 14.
 A dog in the manger, an ugly-natured person who prevents others from enjoying what would be an advantage to them but is none to him.
 Dog ape Zool., a male ape.
 Dog cabbage, or Dog's cabbage Bot., a succulent herb, native to the Mediterranean region (Thelygonum Cynocrambe).
 Dog cheap, very cheap. See under Cheap.
 Dog ear Arch., an acroterium. [Colloq.]
 Dog flea Zool., a species of flea (Pulex canis) which infests dogs and cats, and is often troublesome to man. In America it is the common flea. See Flea, and Aphaniptera.
 Dog grass Bot., a grass (Triticum caninum) of the same genus as wheat.
 Dog Latin, barbarous Latin; as, the dog Latin of pharmacy.
 Dog lichen Bot., a kind of lichen (Peltigera canina) growing on earth, rocks, and tree trunks, -- a lobed expansion, dingy green above and whitish with fuscous veins beneath.
 Dog louse Zool., a louse that infests the dog, esp. Hæmatopinus piliferus; another species is Trichodectes latus.
 Dog power, a machine operated by the weight of a dog traveling in a drum, or on an endless track, as for churning.
 Dog salmon Zool., a salmon of northwest America and northern Asia; -- the gorbuscha; -- called also holia, and hone.
 Dog shark. Zool. See Dogfish.
 Dog's meat, meat fit only for dogs; refuse; offal.
 Dog Star. See in the Vocabulary.
 Dog wheat Bot., Dog grass.
 Dog whelk Zool., any species of univalve shells of the family Nassidæ, esp. the Nassa reticulata of England.
 To give to the dogs, or To throw to the dogs, to throw away as useless. Throw physic to the dogs; I'll none of it.” --Shak.
 To go to the dogs, to go to ruin; to be ruined.