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

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

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

Tractility :: Tractility (n.) The quality of being tractile; ductility.

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..

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

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..

Retractable :: Retractable (a.) Capable of being retracted; retractile.

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

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

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..

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..

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

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

Irretractile :: Irretractile (a.) Not retractile.

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

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

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

Dartos :: Dartos (n.) A thin layer of peculiar contractile tissue directly beneath the skin of the scrotum.

Rhachiglossa :: Rhachiglossa (n. pl.) A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append..

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