| unthrifty | In animals, denoting a failure to grow or develop normally as a result of disease. (05 Mar 2000) |
|---|---|
| untie | 1. To loosen, as something interlaced or knotted; to disengage the parts of; as, to untie a knot. "Sacharissa's captive fain Would untie his iron chain." (Waller) "Her snakes untied, sulphurous waters drink." (Pope) 2. To free from fastening or from restraint; to let loose; to unbind. "Though you untie the winds, and let them fight Against the churches." (Shak) "All the evils of an untied tongue we put upon the accounts of drunkenness." (Jer. Taylor) 3. To resolve; to unfold; to clear. "They quicken sloth, perplexities untie." (Denham) Origin: AS. Untgan. See 1st Un-, and Tie. Source: Websters Dictionary (01 Mar 1998) |
| untranscribed spacer | <molecular biology> In a DNA strand, a spacer sequence that lies between two coding genes. Spacer sequences are not transcribed by RNA polymerase. (09 Oct 1997) |
| untranslated region | <molecular biology> The regions of a cDNA, typically that 5' to the initiation (ATG) site and that 3' to the stop site, which are not translated to make a peptide. Their functions are not well understood. (18 Nov 1997) |