[botany] In botany, sessility (meaning `sitting`, used in the sense of `resting on the surface`) is a characteristic of plants whose flowers or leaves are borne directly from the stem or peduncle, and thus lack a petiole or pedicel. The leaves of the vast majority of monocotyledons lack petioles. ...
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http://en.wikipedia.org/wiki/Sessility_(botany)
[limnology] In limnology, sessility is that quality of an organism which rests unsupported directly on a base, either attached or unattached to a substrate. It is a characteristic of vegetation which is anchored to the benthic environment. There are two families of sessile rotifers: Flosculariidae and Collothecidae. The circalittoral zone o...
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http://en.wikipedia.org/wiki/Sessility_(limnology)
[medicine] In medicine, sessility is a characteristic of tumors and polyps that lack a stalk, as opposed to those that are pedunculated. Literarily, sessile means something floating. In medical study it is used commonly to mean any structure very closely attached or related to another similar or different structure. Examples may be a very t...
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http://en.wikipedia.org/wiki/Sessility_(medicine)
[zoology] In zoology, sessility is a characteristic of some animals, such that they are not able to move about. Sessile animals are usually permanently attached to a solid substrate of some kind, such as a part of a plant, a dead tree trunk, or a rock. For example, barnacles attach themselves to the hull of a ship, but corals lay down their...
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http://en.wikipedia.org/wiki/Sessility_(zoology)
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