| parent | 1. One who begets, or brings forth, offspring; a father or a mother. "Children, obey your parents in the Lord." (Eph. Vi. 1) 2. That which produces; cause; source; author; begetter; as, idleness is the parent of vice. "Regular industry is the parent of sobriety." (Channing) Parent cell. <biology> A nucleus which, in cell division, divides, and gives rise to two or more daughter nuclei. See Karyokinesis, and Cell division, under Division. Origin: L. Parens, -entis; akin to parere to bring forth; cf. Gr. To give, beget: cf. F. Parent. Cf. Part. Source: Websters Dictionary (01 Mar 1998) |
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| parent artery | <anatomy, artery> The artery giving origin to a given artery; the artery of which a given artery is a branch. (05 Mar 2000) |
| parent cell | A cell which, by division, gives rise to two or more daughter cell's. Synonym: brood cell, metrocyte, parent cell. (05 Mar 2000) |
| parent-child relations | The interactions between parent and child. (12 Dec 1998) |
| parent cyst | A hydatid cyst from the inner, or germinal, layer, from which secondary cyst's containing scoleces (daughter cyst's) are developed; sometimes tertiary cyst's (granddaughter cyst's) are developed within the daughter cyst's; occurs most frequently in the liver, but may be found in other organs and tissues; symptoms are those of a tumour of the part affected. Synonym: parent cyst. (05 Mar 2000) |
| parent material | <ecology> The unconsolidated and more or less weathered mineral or organic matter from which the soil profile is developed. (09 Oct 1997) |
| single parent | An unmarried natural, adoptive, or substitute parent of a dependent child, whether living with or visiting the child. To be used also for single-parent families. The concept includes the never-married, as well as the divorced and widowed. (12 Dec 1998) |
| unconsolidated parent material | <ecology> Material from which a soil develops. (09 Oct 1997) |
| amphoteric element | An element one or more of whose oxides unite with water to form hydroxides that may act as acids or as bases (e.g., aluminum). (05 Mar 2000) |
| anatomical element | Any anatomical unit, such as a cell. Synonym: morphologic element. (05 Mar 2000) |
| vessel element | Part of a xylem vessel in a higher plant, arising from a single cell. The end walls are perforated and may completely disappear, giving rise to a continuous tube. The remaining walls are thickened and lignified and there is no protoplast. (18 Nov 1997) |
| volume element | See: voxel. (05 Mar 2000) |
| P element | <molecular biology> A class of Drosophila transposon, widely used as a vector for reporter genes, for efficient germ line transformation and for enhancer trap or insertional mutagenesis studies. (18 Nov 1997) |
| mobile genetic element | <molecular biology> Small, mobile DNA sequences that can replicate and insert copies at random sites within chromosomes. They have nearly identical sequences at each end, oppositely oriented (inverted) repeats and code for the enzyme, transposase, that catalyses their insertion. Bacteria have two types of transposon, simple transposons that have only the genes needed for insertion and complex transposons that contain genes in addition to those needed for insertion. Eukaryotes contain two classes of mobile genetic elements, the first are like bacterial transposons in that DNA sequences move directly. The second class (retrotransposons) move by producing RNA that is transcribed, by reverse transcriptase, into DNA which is then inserted at a new site. (13 Nov 1997) |
| picture element | <microscopy> Any segment of a video scan line whose dimension along the line is equal to the line spacing. (05 Aug 1998) |