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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..

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

Irretractile :: Irretractile (a.) Not retractile.

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

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

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

Myophan :: Myophan (n.) A contractile striated layer found in the bodies and stems of certain Infusoria.

Stoma :: Stoma (n.) The minute breathing pores of leaves or other organs opening into the intercellular spaces, and usually bordered by two contractile cells..

Retractile :: Retractile (a.) Capable of retraction; capable of being drawn back or up; as, the claws of a cat are retractile..

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

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

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..

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..

Pseudo-heart :: Pseudo-heart (n.) Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system..

Linguatulina :: Linguatulina (n. pl.) An order of wormlike, degraded, parasitic arachnids. They have two pairs of retractile hooks, near the mouth. Called also Pentastomida..

Foussa :: Foussa (n.) A viverrine animal of Madagascar (Cryptoprocta ferox). It resembles a cat in size and form, and has retractile claws..

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

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

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

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

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