adventitia n. [L. adventitius, extraordinary] The connective tissue covering of an organ (mainly fibroelastic in nature), such as the heart, or blood vessels.
adventitious a. [L. adventitius, extraordinary] Acquired; accidental; additional; occurring in abnormal places; ectopic foci.
adventitious bud (BRYO: Phylactolaemata) The small bud pri-mordium on the dorsal side of the main bud near the parental polypide.
adventitious vein (ARTHRO: Insecta) A secondary wing vein, neither accessory nor intercalary, usually the result of cross veins lined up to form a continuous vein.
adventive a. [L. advenire, to arrive] Referring to an organism that has been accidentally introduced to a new area; not native.
adventral line (ARTHRO: Insecta) A line that extends along the underside of caterpillars between the middle and the base of the legs.
adventral tubercle (ARTHRO: Insecta) In caterpillars, a small pimple, sometimes bearing setae, located on each of the abdominal segments on the inner base of the leg and apodal segment.
advolute n. [L. ad, near; voluta, spiral] (MOLL: Gastropoda) A condition of whorls that barely touch one another, not distinctly overlapping.
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