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{adj: acinar, acinous, acinose, acinic} pertaining to one of the small sacs (as in a compound gland)

{adj: alveolar} pertaining to the tiny air sacs of the lungs

{adj: capsular} resembling a capsule
"the capsular ligament is a sac surrounding the articular cavity of a freely movable joint and attached to the bones"

{n: Ascomycetes, class Ascomycetes} large class of higher fungi coextensive with division Ascomycota: sac fungi

{n: Ascomycota, subdivision Ascomycota, Ascomycotina, subdivision Ascomycotina} a large subdivision of Eumycota including Hemiascomycetes and Plectomycetes and Pyrenomycetes and Discomycetes; sac fungi; in some classification systems considered a division of the kingdom Fungi

{n: Geastrum coronatum} an earthstar with a bluish spore sac and a purplish brown gleba; at maturity the outer layer splits into rays that bend backward and elevate the spore sac

{n: Meckel's diverticulum} a congenital diverticulum in the ileum resulting from incomplete closure of the yolk sac

{n: Psilopsida, class Psilopsida, Psilotatae, class Psilotatae} whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs

{n: Pulmonata, order Pulmonata} large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails

{n: Sauk, Sac} a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay

{n: acinus} one of the small sacs or saclike dilations in a compound gland

{n: air bladder, swim bladder} an air-filled sac near the spinal column in many fishes that helps maintain buoyancy

{n: air sac} any of the membranous air-filled extensions of the lungs of birds

{n: air sac} any of the thin-walled extensions of the tracheae of insects

{n: alveolar ectasia} abnormal enlargement of the air sacs in the lungs

{n: alveolus, air sac, air cell} a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

{n: amnion, amniotic sac, amnios} thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

{n: bladder, vesica} a distensible membranous sac (usually containing liquid or gas)

{n: blind alley, cul de sac, dead-end street, impasse} a street with only one way in or out

{n: bursa} a small fluid-filled sac located between movable parts of the body especially at joints

{n: chorion} outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

{n: cisterna, cistern} a sac or cavity containing fluid especially lymph or cerebrospinal fluid

{n: cul, cul de sac, dead end} a passage with access only at one end

{n: cyst} a closed sac that develops abnormally in some body structure

{n: dacryocystitis} inflammation of the lacrimal sac causing obstruction of the tube draining tears into the nose

{n: gallbladder} a muscular sac attached to the liver that secretes bile and stores it until needed for digestion

{n: hooded seal, bladdernose, Cystophora cristata} medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters

{n: hydatid mole, hydatidiform mole, molar pregnancy} an abnormality during pregnancy; chorionic villi around the fetus degenerate and form clusters of fluid-filled sacs; usually associated with the death of the fetus

{n: hydrocele} disorder in which serous fluid accumulates in a body sac (especially in the scrotum)

{n: induction of labor} (obstetrics) inducing the childbirth process artificially by administering oxytocin or by puncturing the amniotic sac

{n: lacrimal sac, tear sac, dacryocyst} either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands

{n: meningocele} a congenital anomaly of the central nervous system in which a sac protruding from the brain or the spinal meninges contains cerebrospinal fluid (but no nerve tissue)

{n: microspore} smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte

{n: myelomeningocele} a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation

{n: nasolacrimal duct} a duct that carries tears from the lacrimal sac to the nasal cavity

{n: nucellus} central part of a plant ovule; contains the embryo sac

{n: pericardial sac} the membrane surrounding the heart

{n: perisperm} the nutritive tissue outside the sac containing the embryo in some seeds

{n: peritoneal cavity, greater peritoneal sac} the interior of the peritoneum; a potential space between layers of the peritoneum

{n: pouch, sac, sack, pocket} an enclosed space
"the trapped miners found a pocket of air"

{n: rudiment} the remains of a body part that was functional at an earlier stage of life
"Meckel's diverticulum is the rudiment of the embryonic yolk sac"

{n: sac fungus} any of various ascomycetous fungi in which the spores are formed in a sac or ascus

{n: saccule, sacculus} a small sac or pouch (especially the smaller chamber of the membranous labyrinth)

{n: sac} a structure resembling a bag in an animal

{n: sporangium, spore case, spore sac} organ containing or producing spores

{n: theca, sac} a case or sheath especially a pollen sac or moss capsule

{n: urinary bladder} a membranous sac for temporary retention of urine

{n: urocele} extravasation of urine into the scrotal sac

{n: vesicle, cyst} a small anatomically normal sac or bladderlike structure (especially one containing fluid)

{n: vitelline circulation} circulation of blood between the embryo and the yolk sac

{n: woolly adelgid} an insect that feeds on hemlocks; its egg sacs are small fuzzy white balls like artificial snow on a Christmas tree

{n: yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus} membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional

{n: yolk sac} membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo

{v: enucleate} remove (a tumor or eye) from an enveloping sac or cover

{v: vascularize, vascularise} make vascular
"the yolk sac is gradually vascularized"

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