| sagitta | 1. <astronomy> A small constellation north of Aquila; the Arrow. 2. The keystone of an arch. 3. <geometry> The distance from a point in a curve to the chord; also, the versed sine of an arc; so called from its resemblance to an arrow resting on the bow and string. 4. <anatomy> The larger of the two otoliths, or ear bones, found in most fishes. 5. <zoology> A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chaetognatha. Origin: L, an arrow. Source: Websters Dictionary (01 Mar 1998) |
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| sagittal | 1. Of or pertaining to an arrow; resembling an arrow; furnished with an arowlike appendage. 2. <anatomy> Of or pertaining to the sagittal suture; in the region of the sagittal suture; rabdoidal; as, the sagittal furrow, or groove, on the inner surface of the roof of the skull. In the mesial plane; as, a sagittal section of an animal. <anatomy> Sagittal suture, the suture between the two parietal bones in the top of the skull. Synonym: rabdoidal suture, and interparietal suture. Origin: L. Sagitta an arrow: cf. F. Saguttal. Source: Websters Dictionary (01 Mar 1998) |
| sagittal axis | In dentistry, the line in the frontal plane around which the working side condyle rotates during mandibular movement. (05 Mar 2000) |
| sagittal border of parietal bone | The medial border of the parietal bone entering into the sagittal suture. Synonym: margo sagittalis ossis parietalis. (05 Mar 2000) |
| sagittal crest | A prominent ridge along the sagittal suture of the skull, present in some animals as a result of temporal muscle development. (05 Mar 2000) |
| sagittal fontanel | An occasional fontanel-like defect in the sagittal suture in the newborn. Synonym: Gerdy's fontanel. (05 Mar 2000) |
| sagittal groove | The groove in the midline of the inner table of the calvaria lodging the superior sagittal sinus. Synonym: sulcus sinus sagittalis superioris, sagittal groove, sagittal sulcus, superior longitudinal sulcus. (05 Mar 2000) |
| sagittal line | Any line parallel to the midline, indicating a sagittal plane. (05 Mar 2000) |
| sagittal plane | <dentistry> The longitudinal vertical plane that divides the mouth into two halves (left and right.) (08 Jan 1998) |
| sagittal section | A cross section obtained by slicing, actually or through imaging techniques, the body or any part of the body, or any anatomic structure in the sagittal plane, i.e., in a vertical plane parallels to the median plane. Since actual sectioning in the sagittal plane results in a right and a left portion, an anatomical sagittal section may be a two-dimensional view of the cut surface on the medial aspect of either portion. Synonym: parasagittal section. (05 Mar 2000) |
| sagittal split mandibular osteotomy | An intraoral surgical procedure for correction of retrognathism, apertognathia, and prognathism; the mandibular rami and posterior body are sectioned in the sagittal plane. (05 Mar 2000) |
| sagittal sulcus | The groove in the midline of the inner table of the calvaria lodging the superior sagittal sinus. Synonym: sulcus sinus sagittalis superioris, sagittal groove, sagittal sulcus, superior longitudinal sulcus. (05 Mar 2000) |
| sagittal suture | Line of union between the two parietal bones. Synonym: sutura sagittalis, interparietal suture, sutura interparietalis. (05 Mar 2000) |
| sagittal synostosis | <anatomy> A deformed condition of the skull, in which the vault is narrow, clongated, and more or less boat-shaped. Origin: Gr. A boat + head. Source: Websters Dictionary (01 Mar 1998) |
| sagittalis | Synonym: sagittal. Origin: L. (05 Mar 2000) |
| Dipus sagitta | A small rodent of southern Russia that serves as a vector, through fleas, of Yersinia pestis (plague bacillus). Origin: G. Dipous, jerboa, two-footed; L. Sagitta, arrow (05 Mar 2000) |
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