| tenth cranial nerve | <anatomy, nerve> The vagus nerve enervates the gut (gastrointestinal tract), heart and larynx. Lesions of the tenth nerve usually result in a horse voice, but may also cause difficulty in swallowing or talking. Synonym: cranial nerve X. (27 Sep 1997) |
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| tenth-value layer | <radiobiology> Thickness of a specified substance which, when introduced into the path of a given beam of radiation, reduces the absorbed dose index or dose-equivalent index to one-tenth. The magnitude of the tenth-value layer may be different for absorbed dose index and dose equivalent index. (16 Dec 1997) |
| tenthmetre | <physics> A unit for the measurement of many small lengths, such that 10^10 of these units make one meter; the ten millionth part of a millimetre. Source: Websters Dictionary (01 Mar 1998) |
| tenthredinides | <zoology> A group of Hymneoptera comprising the sawflies. Origin: NL, fr. Gr. A kind of wasp. Source: Websters Dictionary (01 Mar 1998) |