| involucel | <botany> A secondary involucre, as the bracts subtending the secondary umbels in the family Umbelliferae. (19 Oct 1998) |
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| involucellate | <botany> Furnished with involucels. Source: Websters Dictionary (01 Mar 1998) |
| involucrated | <botany> Having an involucre; involucred. Source: Websters Dictionary (01 Mar 1998) |
| involucre | <botany> A group of bracts enveloping a condensed inflorescence, a layer of tissue enveloping some plant parts. (28 Oct 1998) |
| involucred | <botany> Having an involucre, as umbels, heads, etc. Source: Websters Dictionary (01 Mar 1998) |
| involucret | <botany> An involucel. Source: Websters Dictionary (01 Mar 1998) |
| involucrin | <protein> Marker protein for keratinocyte differentiation first appearing in the upper spinous layer of the epidermis. Together with trichohyalin forms the scaffold for the cell envelope. (18 Nov 1997) |
| involucrum | 1. <botany> See Involucre. 2. <zoology> A sheath which surrounds the base of the lasso cells in the Siphonophora. Origin: L. See Involucre. Source: Websters Dictionary (01 Mar 1998) |
| involuntariness | The quality or state of being involuntary; unwillingness; automatism. Source: Websters Dictionary (01 Mar 1998) |
| involuntary | 1. Not having will of the power of choice. 2. Not under the influence or control of the will; not voluntary; as, the involuntary movements of the body; involuntary muscle fibres. 3. Not proceeding from choice; done unwillingly; reluctant; compulsory; as, involuntary submission. Origin: L. Involuntarius. (28 Oct 1998) |
| involuntary guarding | Abdominal muscle spasm, caused by retroperitoneal inflammation, which cannot be willfully suppressed. (05 Mar 2000) |
| involuntary muscles | Muscle's not ordinarily under control of the will; except in the case of the heart, they are smooth (nonstriated) muscle's, innervated by the autonomic nervous system. (05 Mar 2000) |
| involuntary nervous system | <anatomy> Neurons that are not under conscious control, comprising two antagonistic components, the sympathetic and parasympathetic nervous systems. The autonomic nervous system regulates key functions including the activity of the cardiac (heart) muscle, smooth muscles (e.g., of the gut), and glands. The autonomic nervous system has two divisions: 1. The sympathetic nervous system that accelerates the heart rate, constricts blood vessels, and raises blood pressure. 2. The parasympathetic nervous system slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles. (03 Jul 1999) |
| involute | <botany> Rolled inwards, of a leaf, with the margins rolled towards the adaxial surface. (28 Oct 1998) |
| involuted | 1. <botany> Rolled inward from the edges; said of leaves in vernation, or of the petals of flowers in aestivation. 2. <zoology> Turned inward at the margin, as the exterior lip of the Cyprea. Rolled inward spirally. Origin: L. Involutus, p. P. Of involvere. See Involve. Source: Websters Dictionary (01 Mar 1998) |