canal

1. (astronomy) an indistinct surface feature of Mars once thought to be a system of channels;
   They are now believed to be an optical illusion (synset 109255224)
   referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
   is a type of: channel - a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels
2. A bodily passage or tube lined with epithelial cells and conveying a secretion or other substance (synset 105258141)
   "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"
   is a type of: passage, passageway - a path or channel or duct through or along which something may pass
   subtypes:

   • pore - any small opening in the skin or outer surface of an animal
   • canalis vertebralis, spinal canal, vertebral canal - the canal in successive vertebrae through which the spinal cord passes
   • ductule, ductulus - a very small duct
   • canaliculus - a small canal or duct as in some bones and parts of plants
   • canal of schlemm, schlemm's canal, sinus venosus sclerae - a circular canal in the eye that drains aqueous humor from the anterior chamber of the eye into the anterior ciliary veins
   • sinus, venous sinus - a wide channel containing blood; does not have the coating of an ordinary blood vessel
   • lachrymal duct, lacrimal duct, tear duct - any of several small ducts that carry tears from the lacrimal glands
   • nasolacrimal duct - a duct that carries tears from the lacrimal sac to the nasal cavity
   • haversian canal - any of the many tiny canals that contain blood vessels and connective tissue and that form a network in bone
   • hepatic duct - the duct that drains bile from the liver
   • canalis inguinalis, inguinal canal - oblique passage through the lower abdominal wall; in males it is the passage through which the testes descend into the scrotum and it contains the spermatic cord; in females it transmits the round ligament of the uterus
   • bile duct, common bile duct - a duct formed by the hepatic and cystic ducts; opens into the duodenum
   • pancreatic duct - a duct connecting the pancreas with the intestine
   • lymph vessel, lymphatic vessel - a vascular duct that carries lymph which is eventually added to the venous blood circulation
   • salivary duct - a duct through which saliva passes from the salivary gland into the mouth
   • aqueductus cerebri, cerebral aqueduct, sylvian aqueduct - a canal connecting the third and fourth ventricles
   • ureter - either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder
   • urethra - duct through which urine is discharged in most mammals and which serves as the male genital duct
   • canalis cervicis uteri, cervical canal - a spindle-shaped canal extending from the uterus to the vagina
   • umbilical, umbilical cord - membranous duct connecting the fetus with the placenta
   • vagina - the lower part of the female reproductive tract; a moist canal in female mammals extending from the labia minora to the uterus
   • epididymis - a convoluted tubule in each testis; carries sperm to vas deferens
   • ductus deferens, vas deferens - a duct that carries spermatozoa from the epididymis to the ejaculatory duct
   • seminal duct - the efferent duct of the testis in man
   • ejaculatory duct - a part of the seminal duct formed by the duct from the seminal vesicle and the vas deferens; passes through the prostate gland
   • cartilaginous tube - a duct with cartilaginous walls
   • bronchiole - any of the smallest bronchial ducts; ending in alveoli
   • alimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, gi tract - tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
   • lactiferous duct - ducts of the mammary gland that carry milk to the nipple
   has: ampulla - the dilated portion of a canal or duct especially of the semicircular canals of the ear
   same as: channel, duct, epithelial duct
3. Long and narrow strip of water made for boats or for irrigation (synset 102950684)
   is a type of: watercourse, waterway - a conduit through which water flows
   subtypes:

   • cut - a canal made by erosion or excavation
   • industrial watercourse - a canal that is operated by one or more industries
   • race, raceway - a canal for a current of water
   • ship canal, shipway - a canal large enough for seagoing vessels
   specific instances:

   • caledonian canal - a canal in northern Scotland that links North Sea with the Atlantic Ocean; runs diagonally between Moray Firth at the northeastern end and Loch Linnhe at the southwestern end; now little used
   • caloosahatchee canal - a canal that connects Lake Okeechobee with the Caloosahatchee River in southern Florida to form part of the Cross-Florida Waterway
   • grand canal - an inland waterway 1000 miles long in eastern China; extends from Tianjin in the north to Hangzhou in the south
   • grand canal - the major waterway in Venice, Italy
   • cape cod canal - a canal connecting Cape Cod Bay with Buzzards Bay
   • erie canal - an artificial waterway connecting the Hudson river at Albany with Lake Erie at Buffalo; built in the 19th century; now part of the New York State Barge Canal
   • new york state barge canal - a system of canals crossing New York State and connecting the Great Lakes with the Hudson River and Lake Champlain
   has:

   • lock, lock chamber - enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it
   • lockage - a system of locks in a canal or waterway

1. Provide (a city) with a canal (synset 202341011)
   is a type of: furnish, provide, render, supply - give something useful or necessary to
   same as: canalise, canalize

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