| high tide line | The line of intersection of the land with the water's surface at the maximum height reached by a rising tide. The high tide line may be determined, in the absence of actual data, by a line of oil or scum along shore objects, a more or less continuous deposit of fine shell or debris on the foreshore or berm, other physical markings or characteristics, vegetation lines, tidal gages, or other suitable means that delineate the general height reached by a rising tide. The line encompasses spring high tides and other high tides that occur with periodic frequency but does not include storm surges in which there is a departure from the normal or predicted reach of the tide due to the piling up of water against a coast by strong winds such as those accompanying a hurricane or other intense storm. (09 Oct 1997) |
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| Hilton's white line | A bluish pink, narrow, wavy zone in the mucosa of the anal canal below the pectinate line at the level of the interval between the subcutaneous part of the external sphincter and the lower border of the internal sphincter, said to be palpable. Synonym: Hilton's white line. (05 Mar 2000) |
| His' line | A line extending from the tip of the anterior nasal spine (acanthion) to the hindmost point on the posterior margin of the foramen magnum (opisthion), dividing the face into an upper and a lower, or dental part. (05 Mar 2000) |
| second line chemotherapy | <oncology> Chemotherapy given for a tumour which has already failed to respond to a first chemotherapy regimen (called first line). (16 Dec 1997) |
| Holden's line | The crease or furrow of the skin of the groin caused by flexion of the thigh. (05 Mar 2000) |
| semilunar line | The slight groove in the external abdominal wall parallel to the lateral edge of the rectus sheath. Synonym: semilunar line, Spigelius' line. (05 Mar 2000) |
| Hudson-Stahli line | <clinical sign, ophthalmology> A brown, horizontal line across the lower third of the cornea, occasionally seen in the aged and also in association with corneal opacities. (05 Mar 2000) |
| Sergent's white line | A pale streak appearing within 30 to 60 seconds after stroking the skin with a fingernail, and lasting for several minutes; regarded as a sign of diminished arterial tension. Synonym: Sergent's white line. (05 Mar 2000) |
| Hunter's line | A fibrous band running vertically the entire length of the centre of the anterior abdominal wall, receiving the attachments of the oblique and transverse abdominal muscles. Synonym: Hunter's line, white line. (05 Mar 2000) |
| Shenton's line | A curved line formed by the top of the obturator foramen and the inner side of the neck of the femur, seen on an anteroposterior frontal radiograph of a normal hip joint; it is disturbed in lesions of the joint such as dislocation or fracture. (05 Mar 2000) |
| S-N line | A line connecting a point (S) representing the centre of the sella turcica with the frontonasal junction (N); it denotes the anterior portion of the cranial base in cephalometrics. (05 Mar 2000) |
| soleal line | A ridge which extends obliquely downward and medially across the back of the tibia from the fibular articular facet; it gives origin to the soleus muscle. Synonym: linea musculi solei, line for soleus muscle, linea poplitea, popliteal line. (05 Mar 2000) |
| Spigelius' line | The slight groove in the external abdominal wall parallel to the lateral edge of the rectus sheath. Synonym: semilunar line, Spigelius' line. (05 Mar 2000) |
| spiral line | A rough line that separates the neck and shaft of the femur anteriorly; it passes downward and medially from the greater trochanter to the lesser trochanter and continues into the medial lip of the linea aspera. Synonym: linea intertrochanterica, linea spiralis, spiral line. (05 Mar 2000) |
| stabilizing fulcrum line | An imaginary line connecting occlusal rests, around which line the denture tends to rotate under masticatory force. (05 Mar 2000) |