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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..

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

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

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..

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

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

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

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..

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

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

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

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.

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

Irretractile :: Irretractile (a.) Not retractile.

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

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..

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

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..

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