| six | One more than five; twice three; as, six yards. <medicine> Six Nations See Nine points circle, under Nine. Origin: AS. Six, seox, siex; akin to OFries. Sex, D. Zes, OS. & OHG. Sehs, G. Sechs, Icel, Sw, & Dan. Sex, Goth. Saihs, Lith. Szeszi, Russ. Sheste, Gael. & Ir. Se, W. Chwech, L. Sex, Gr, Per. Shesh, Skr. Shash. Cf. Hexagon, Hexameter, Samite, Senary, Sextant, Sice. Source: Websters Dictionary (01 Mar 1998) |
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| sixth cranial nerve | <anatomy> The abducent nerve enervates a muscle which moves the eyeball. Lesions of the sixth cranial nerve result in deviation of the eyeball outward and double vision. Synonym: cranial nerve VI. (27 Sep 1997) |
| sixth disease | A viral disease of infants and young children with sudden onset of high fever which lasts several days and then suddenly subsides leaving in its wake a fine red rash. The causative agent is herpes virus type 6 so the disease is known as sixth disease. Also known as exanthem subitum (sudden rash), pseudorubella, roseola, roseola infantilis, and roseola infantum. (12 Dec 1998) |
| sixth sense | The general sense of bodily existence; the sensation caused by the functioning of the internal organs. Synonym: coenesthesia, sixth sense. Origin: G. Koinos, common, + aisthesis, sensation (05 Mar 2000) |
| sixth venereal disease | A venereal infection usually caused by Chlamydia trachomatis, and characterised by a transient genital ulcer and inguinal adenopathy in the male; in the female, perirectal lymph nodes are involved and rectal stricture is a common occurrence. Synonym: climatic bubo, Favre-Durand-Nicholas disease, lymphogranuloma inguinale, Nicolas-Favre disease, sixth venereal disease, tropical bubo. (05 Mar 2000) |
| sixth ventricle | An inconstant, horizontal, slitlike space between the posterior one-third of the corpus callosum and the underlying commissura fornicis (commissura hippocampi; psalterium) resulting from failure of these two commissural plates to fuse completely during foetal development; like the cavity of the septum pellucidum, the space is not a true ventricle in the sense that it did not develop from the central canal of the neural tube. Synonym: cavum psalterii, cavum vergae, sixth ventricle. (05 Mar 2000) |
| sixth-year molar | The first permanent molar tooth. (05 Mar 2000) |