| invisible | Incapable of being seen; not perceptible by vision; not visible. "To us invisible, or dimly seen In these thy lowest works. <zoology> " (Milton) Invisible bird, a small, shy singing bird (Myadestes sibilons), of St. Vincent Islands. Invisible green, a very dark shade of green, approaching to black, and liable to be mistaken for it. Origin: F. Invisible, L. Invisibilis. See In- not, and Visible. Source: Websters Dictionary (01 Mar 1998) |
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| invisible differentiation | Differentiation of the cellular chemical constituents in the embryo prior to cytodifferentiation; sometimes recognizable histochemically. Synonym: invisible differentiation. (05 Mar 2000) |
| invisible spectrum | The radiation lying on either side of visible light, i.e., infrared and ultraviolet light. (05 Mar 2000) |
| invision | Want of vision or of the power of seeing. Source: Websters Dictionary (01 Mar 1998) |
| involucel | <botany> A secondary involucre, as the bracts subtending the secondary umbels in the family Umbelliferae. (19 Oct 1998) |
| 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) |