| OMP decarboxylase | <enzyme> An enzyme that catalyses the conversion of OMP to UMP and CO2; a defect or inhibition of this enzyme will result in orotic aciduria and orotidinuria; this enzyme is a part of pyrimidine biosynthesis. Compare: uridylic acid synthase. Synonym: OMP decarboxylase. (05 Mar 2000) |
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| OMP pyrophosphorylase | <enzyme> The enzyme catalyzing the formation of orotidine-5'-phosphoric acid (orotidylic acid) from orotic acid and 5-phosphoribosyl-1-pyrophosphate in the course of pyrimidine nucleotide biosynthesis. Chemical name: Orotidine-5'-phosphate:pyrophosphate phospho-alpha-D-ribosyltransferase Registry number: EC 2.4.2.10 (12 Dec 1998) |
| OMPA | <abbreviation> Octamethyl pyrophosphoramide. (05 Mar 2000) |
| omphacine | Of, pertaining to, or expressed from, unripe fruit; as, omphacine oil. Origin: Gr, from an unripe grape or olive: cf.F. Omphacin. Source: Websters Dictionary (01 Mar 1998) |
| omphal- | Omphalo- The umbilicus, the navel. Origin: G. Omphalos, navel (umbilicus) (05 Mar 2000) |
| omphalectomy | Excision of the umbilicus or of a neoplasm connected with it. Origin: omphal-+ G. Ektome, excision (05 Mar 2000) |
| omphalelcosis | Ulceration at the umbilicus. Origin: omphal-+ G. Helkosis, ulceration (05 Mar 2000) |
| omphalic | <anatomy> Of or pertaining to the umbilicus, or navel. Origin: Gr. Having a boss, bossy, fr. The navel. See Navel. Source: Websters Dictionary (01 Mar 1998) |
| omphalitis | Inflammation of the umbilicus and surrounding parts. (05 Mar 2000) |
| omphalo- | See: omphal-. (05 Mar 2000) |
| omphaloangiopagus | Unequal conjoined twins in which the parasite derives its blood supply from the placenta of the autosite. See: conjoined twins. Synonym: allantoidoangiopagus. Origin: omphalo-+ G. Angeion, vessel, + pagos, something fixed (05 Mar 2000) |
| omphalocele | <medicine> A hernia at the navel. Origin: Gr. The navel + a tumour: cf.F. Omphalocele. Source: Websters Dictionary (01 Mar 1998) |
| omphalode | <botany> The central part of the hilum of a seed, through which the nutrient vessels pass into the rhaphe or the chalaza. Synonym: omphalodium. Origin: Omphalo- + Gr. Form. Source: Websters Dictionary (01 Mar 1998) |
| omphaloenteric | Relating to the umbilicus and the intestine. (05 Mar 2000) |
| omphalomancy | Divination by means of a child's navel, to learn how many children the mother may have. Origin: Omphalo- + -mancy. Source: Websters Dictionary (01 Mar 1998) |