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单词 earthworm
释义

earthworm


earth·worm

E0009600 (ûrth′wûrm′)n. Any of various terrestrial annelid worms of the class Oligochaeta, especially those of the family Lumbricidae, that burrow into and help aerate and enrich soil.

earthworm

(ˈɜːθˌwɜːm) n (Animals) any of numerous oligochaete worms of the genera Lumbricus, Allolobophora, Eisenia, etc, which burrow in the soil and help aerate and break up the ground.

earth•worm

(ˈɜrθˌwɜrm)

n. any annelid worm that burrows in soil, esp. a worm of the genus Lumbricus. [1400–50]

earth·worm

(ûrth′wûrm′) Any of various segmented worms living in the ground that burrow into and enrich soil. Earthworms are annelids, related to the leeches, and vary in size from a few inches to 11 feet (3 meters) in length. See Note at worm.
Thesaurus
Noun1.earthworm - terrestrial worm that burrows into and helps aerate soilearthworm - terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglersdew worm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, angleworm, crawler, wigglerclass Oligochaeta, Oligochaeta - earthwormsoligochaete, oligochaete worm - hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body

earthworm

nounRelated words
adjective lumbricoid
Translations
蚯蚓

earth

(əːð) noun1. the third planet in order of distance from the Sun; the planet on which we live. Is Earth nearer the Sun than Mars is?; the geography of the earth. 地球 地球2. the world as opposed to heaven. heaven and earth. 人間 尘世,人间 3. soil. Fill the plant-pot with earth.4. dry land; the ground. the earth, sea and sky. 陸地,地面 陆地,地面 5. a burrow or hole of an animal, especially of a fox. 洞穴 洞穴6. (a wire that provides) an electrical connection with the earth. 接地(接地線) (电)接地 verb to connect to earth electrically. Is your washing-machine properly earthed? (電機)接地 接地ˈearthen adjective (of a floor etc) made of earth. 土製的,陶製的 泥土做的,陶制的 ˈearthly adjective1. of or belonging to this world; not heavenly or spiritual. this earthly life. 世俗的 人间的,地球的 2. possible. This gadget has no earthly use. 可能的 可能的ˈearthenware noun, adjective (of) a kind of pottery coarser than china. an earthenware dish. 陶器 陶器ˈearthquake noun a shaking of the earth's surface. The village was destroyed by an earthquake. 地震 地震ˈearthworm noun (usually worm) a kind of small animal with a ringed body and no backbone, living in damp earth. 蚯蚓 蚯蚓on earth used for emphasis. What on earth are you doing?; the stupidest man on earth. (用於加強語氣)究竟 (用于加强语气)究竟 run to earth to find (something or someone) after a long search. He ran his friend to earth in the pub. 鍥而不捨地尋找 经过长时间追查后找到

earthworm


earthworm,

terrestrial, cylindrical segmented worm of the class Oligochaeta. There are 2,200 earthworm species, found all over the world except in arid and arctic regions and ranging in size from 1 in. (2.5 cm) to the 11-ft (330-cm) giant worms of the tropics. Some earthworms are pallid in color, many are reddish brown to purple, and one Philippino species is bright blue. Earthworms burrow in the ground, swallowing soil from which the organic material is extracted and ground up in the gizzard and depositing the residue as castings outside the burrow. They come to the surface only on cloudy days and at night (hence the name night crawlers) unless they are flooded out by heavy rainfalls. In cold and dry weather they retreat into their burrows and remain dormant. The segments of the earthworm, visible externally as rings, are separated by internal partitions. On each segment are four pairs of bristles, or setae, with which the worm anchors itself to the walls of the burrow, drawing itself forward by rhythmic muscular contractions. There is a nerve cord, with ganglia in each segment and an enlarged cerebral ganglion (a primitive brain) at the anterior end. Although they have no prominent sense organs, earthworms are sensitive to light, touch, vibration, and chemicals. The circulatory system is enclosed in vessels; the blood (which contains hemoglobin) is pumped by muscular contractions of five linearly arranged hearts. Earthworms are hermaphroditic, but they cross-fertilize. Two worms exchange sperm cells during copulation; fertilization occurs after the worm's own eggs and the received sperm are encased in a tough sheath secreted by the clitellum, a conspicuous band of tissue near the anterior end. The sheath slips over the worm's head and is deposited underground, where it serves as a cocoon for the developing young. There is no larval stage; the young hatch as miniature adults. The common American and European earthworm, Lumbricus terrestris, up to 10 in. (25 cm) long, with about 150 segments, is used for laboratory dissection and study. Earthworms are also used as live bait and are eaten by some peoples—such as the Maoris, who consider certain species delicacies. The earthworm's greatest service, however, of immense importance to agriculture, is aerating and mixing the soil. Earthworm castings bring to the surface from 7 to 18 tons of soil per acre annually. This invaluable function of the earthworm was first pointed out in a detailed study by Charles Darwin. Earthworms are classified in the phylum AnnelidaAnnelida
[Lat., anellus=a ring], phylum of soft-bodied, bilaterally symmetrical (see symmetry, biological), segmented animals, known as the segmented, or annelid, worms.
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, class Oligochaeta, order Opisthopora.

earthworm

[′ərth‚wərm] (invertebrate zoology) The common name for certain terrestrial members of the class Oligochaeta, especially forms belonging to the family Lumbricidae.

earthworm

any of numerous oligochaete worms of the genera Lumbricus, Allolobophora, Eisenia, etc., which burrow in the soil and help aerate and break up the ground

earthworm


earthworm

(ûrth′wûrm′)n. Any of various terrestrial annelid worms of the class Oligochaeta, especially those of the family Lumbricidae, that burrow into and help aerate and enrich soil.

earthworm

any ANNELID of the order Oligochaeta.

earthworm


  • noun

Synonyms for earthworm

noun terrestrial worm that burrows into and helps aerate soil

Synonyms

  • dew worm
  • fishing worm
  • fishworm
  • nightcrawler
  • nightwalker
  • red worm
  • angleworm
  • crawler
  • wiggler

Related Words

  • class Oligochaeta
  • Oligochaeta
  • oligochaete
  • oligochaete worm
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