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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..

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

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

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..

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

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

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

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..

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

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

Irretractile :: Irretractile (a.) Not retractile.

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

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

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

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..

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.

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

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

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