| ulotrichi | Origin: NL, fr. Gr, woolly-haired; woolly +, hair] The division of mankind which embraces the races having woolly or crispy hair. Cf. Leiotrichi. Source: Websters Dictionary (01 Mar 1998) |
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| ulotrichous | Having curly hair. Compare: leiotrichous. Origin: G. Oulotrichos, curly haired, fr. Oulos, wooly, + thrix (trich-), hair (05 Mar 2000) |
| ultimate | 1. Farthest; most remote in space or time; extreme; last; final. "My harbor, and my ultimate repose." (Milton) "Many actions apt to procure fame are not conductive to this our ultimate happiness." (Addison) 2. Last in a train of progression or consequences; tended toward by all that precedes; arrived at, as the last result; final. "Those ultimate truths and those universal laws of thought which we can not rationally contradict." (Coleridge) 3. Incapable of further analysis; incapable of further division or separation; constituent; elemental; as, an ultimate constituent of matter. <chemistry> Ultimate analysis, organic analysis. See Organic. Ultimate belief. See Belief. <mathematics> Ultimate ratio, the limiting value of a ratio, or that toward which a series tends, and which it does not pass. Synonym: Final, conclusive. See Final. Origin: LL. Ultimatus last, extreme, fr. L. Ultimare to come to an end, fr. Ultimus the farthest, last, superl. From the same source as ulterior. See Ulterior, and cf. Ultimatum. Source: Websters Dictionary (01 Mar 1998) |
| ultimate analysis | A description of a fuel's elemental composition as a percentage of the dry fuel weight. (05 Dec 1998) |
| ultimate principle | One of the chemical elements. (05 Mar 2000) |
| ultimate strength | The maximum stress achieved prior to failure of a component on a single application of the load. (05 Mar 2000) |
| ultimatum | Origin: NL. See Ultimate. A final proposition, concession, or condition; especially, the final propositions, conditions, or terms, offered by either of the parties in a diplomatic negotiation; the most favorable terms a negotiator can offer, the rejection of which usually puts an end to the hesitation. Source: Websters Dictionary (01 Mar 1998) |
| ultimobranchial | In embryology, relating to the caudal pharyngeal pouch. Origin: L. Ultimus, last, + G. Branchia, gills (05 Mar 2000) |
| ultimobranchial body | A diverticulum from the fourth pharyngeal pouch of an embryo, regarded by some as a rudimentary fifth pharyngeal pouch and by others as a lateral thyroid primordium. The ultimobranchial bodies of lower vertebrates contain large amounts of calcitonin. In mammals the bodies fuse with the thyroid gland and are thought to develop into the parafollicular cells. (12 Dec 1998) |
| ultimobranchial pouch | A transient fifth pharyngeal pouch; it is now considered to be incorporated into the caudal pharyngeal complex, the cells of which become the parafollicular cells (C cells) of the thyroid. Uterovesical pouch, a pocket formed by the deflection of the peritoneum from the bladder to the uterus in the female. Synonym: excavatio vesicouterina, cavum vesicouterinum, vesicouterine pouch. (05 Mar 2000) |
| ultimum moriens | The right atrium of the heart, said to contract after the rest of the heart is still. Origin: L. The last thing dying (05 Mar 2000) |
| ultisols | <ecology> Highly weathered soils having significantly more clay in the B-horizon than in the A-horizon and having low base status, acidic soils common in the Southwest. (09 Oct 1997) |
| UlTma DNA polymerase | <enzyme> A thermostable DNA polymerase with putative proofreading activity Registry number: EC 2.7.7.- (26 Jun 1999) |
| ultra- | Excess, exaggeration, beyond. Origin: L. Beyond (05 Mar 2000) |
| ultrabrachycephalic | Denoting an extremely short skull, one with an index of at least 90. (05 Mar 2000) |