| quata | <zoology> The coaita. Source: Websters Dictionary (01 Mar 1998) |
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| quater in die | See: q.i.d. Origin: L. Four times a day (05 Mar 2000) |
| quaternary | 1. Fourth in order. 2. Containing four elements or groups. Origin: L. Quaternarius, from quattuor = four (18 Nov 1997) |
| quaternary carbon atom | An atom of carbon to which four other carbon atom's are attached. (05 Mar 2000) |
| quaternary structure | The three-dimensional structure of a complex protein, this especially refers to the way the polypeptide subunits fit together. (09 Oct 1997) |
| quaternary syphilis | Any condition indirectly due to syphilis. Synonym: metasyphilis, parasyphilosis, quaternary syphilis. (05 Mar 2000) |
| quaternion | 1. The number four. 2. A set of four parts, things, or person; four things taken collectively; a group of four words, phrases, circumstances, facts, or the like. "Delivered him to four quaternions of soldiers." (Acts xii. 4) "Ye elements, the eldest birth Of Nature's womb, that in quaternion run." (Milton) "The triads and quaternions with which he loaded his sentences." (Sir W. Scott) 3. A word of four syllables; a quadrisyllable. 4. <mathematics> The quotient of two vectors, or of two directed right lines in space, considered as depending on four geometrical elements, and as expressible by an algebraic symbol of quadrinomial form. The science or calculus of quaternions is a new mathematical method, in which the conception of a quaternion is unfolded and symbolically expressed, and is applied to various classes of algebraical, geometrical, and physical questions, so as to discover theorems, and to arrive at the solution of problems. Origin: L. Quaternio, fr.quaterni four each. See Quaternary. Source: Websters Dictionary (01 Mar 1998) |
| Quatrefages de Breau | Jean L.A. De, French naturalist, 1810-1892. See: Quatrefages' angle. (05 Mar 2000) |
| Quatrefages' angle | An angle formed by the meeting of the prolongation of two lines tangential to the most prominent part of the zygomatic arch and to the parietofrontal suture on each side; when the lines remain parallel the angle is zero; when they diverge it is negative. Synonym: Quatrefages' angle. (05 Mar 2000) |