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

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..

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

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

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..

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

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

Irretractile :: Irretractile (a.) Not retractile.

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

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

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..

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

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..

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..

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

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

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

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..

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..

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

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