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Proboscidifera :: Proboscidifera (n. pl.) An extensive division of pectinibranchiate gastropods, including those that have a long retractile proboscis, with the mouth at the end, as the cones, whelks, tritons, and cowries. See Illust. of Gastropoda, and of Winkle..

Iris :: Iris (n.) The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See Eye..

Rostrifera :: Rostrifera (n. pl.) A division of pectinibranchiate gastropods, having the head prolonged into a snout which is not retractile..

Protrusile :: Protrusile (a.) Capable of being protruded or thrust out; protractile; protrusive.

Tractile :: Tractile (a.) Capable of being drawn out in length; ductile.

Regeneration :: Regeneration (n.) The reproduction or renewal of tissues, cells, etc., which have been used up and destroyed by the ordinary processes of life; as, the continual regeneration of the epithelial cells of the body, or the regeneration of the contractile substance of muscle..

Intractile :: Intractile (a.) Not tractile; incapable of being drawn out or extended.

Rhynchobdellea :: Rhynchobdellea (n. pl.) A suborder of leeches including those that have a protractile proboscis, without jaws. Clepsine is the type..

Chromatophore :: Chromatophore (n.) A contractile cell or vesicle containing liquid pigment and capable of changing its form or size, thus causing changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods..

Distractile :: Distractile (a.) Tending or serving to draw apart.

Muscle :: Muscle (n.) The contractile tissue of which muscles are largely made up.

Vorticella :: Vorticella (n.) Any one of numerous species of ciliated Infusoria belonging to Vorticella and many other genera of the family Vorticellidae. They have a more or less bell-shaped body with a circle of vibrating cilia around the oral disk. Most of the species have slender, contractile stems, either simple or branched..

Contractile :: Contractile (a.) tending to contract; having the power or property of contracting, or of shrinking into shorter or smaller dimensions; as, the contractile tissues..

Atony :: Atony (n.) Want of tone; weakness of the system, or of any organ, especially of such as are contractile..

Irretractile :: Irretractile (a.) Not tractile or ductile.

Irretractile :: Irretractile (a.) Not retractile.

Attractile :: Attractile (a.) Having power to attract.

Protractile :: Protractile (a.) Capable of being protracted, or protruded; protrusile..

Asystole :: Asystole (n.) A weakening or cessation of the contractile power of the heart.

Rhinophore :: Rhinophore (n.) One of the two tentacle-like organs on the back of the head or neck of a nudibranch or tectibranch mollusk. They are usually retractile, and often transversely furrowed or plicate, and are regarded as olfactory organs. Called also dorsal tentacles. See Illust. under Pygobranchia, and Opisthobranchia..

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