| semelincident | <immunology> An obsolete term that means happening once only; said of an infectious disease, one attack of which confers permanent immunity. Origin: L. Semel, once, + incido, to happen, fr. Cado, to fall (05 Mar 2000) |
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| semen | <biology> Ejaculate. The fluid released at orgasm which contains sperm and secretions from the prostate gland. (27 Sep 1997) |
| semen analysis | <gynaecology> Laboratory examination of semen to check the quality and quantity of sperm. (09 Oct 1997) |
| semen preservation | <gynaecology> Methods of preserving semen. (12 Dec 1998) |
| semeniferous | <biology> Seed-bearing; producing seed; pertaining to, or connected with, the formation of semen; as, seminiferous cells or vesicles. Origin: L. Semen, semenis, seed -ferous. Source: Websters Dictionary (01 Mar 1998) |
| semenuria | <urology> The excretion of urine containing semen. Synonym: seminuria, spermaturia. (05 Mar 2000) |
| semi | <prefix> A prefix signifying half, and sometimes partly or imperfectly; as, semiannual, half yearly; semitransparent, imperfectly transparent. The prefix semi is joined to another word either with the hyphen or without it. In this book the hyphen is omitted except before a capital letter; as, semiacid, semiaquatic, semi-Arian, semiaxis, semicalcareous. Origin: L. Semi; akin to Gr, Skr. Sami-, AS. Sam-, and prob. To E. Same, from the division into two parts of the same size. Cf. Hemi-, Sandelend. (29 Oct 1998) |
| semi pupa | <zoology> The young of an insect in a stage between the larva and pupa. Source: Websters Dictionary (01 Mar 1998) |
| semi-apochromatic objective | <microscopy> A compromise, in the correction for chromatic and spherical aberration, between achromatic and apochromatic objectives, such as a fluorite objective. (05 Aug 1998) |
| semi-closed anaesthesia | Inhalation anaesthesia using a circuit in which a portion of the exhaled air is exhausted from the circuit and a portion is rebreathed following absorption of carbon dioxide. (05 Mar 2000) |
| semi-closed circle | A circuit for administration of an inhalation anaesthetic in which partial rebreathing with carbon dioxide absorption is combined with loss from the circuit of a portion of respired gases through valves. (05 Mar 2000) |
| semi-open anaesthesia | <anaesthetics> Inhalation anaesthesia in which a portion of inhaled gases is derived from an anaesthesia circuit while the remainder consists of room air. (05 Mar 2000) |
| semi-vegetarian | A vegetarian who consumes dairy products, eggs, chicken, and fish, but does not consume other animal flesh. (05 Mar 2000) |
| semiacid | Slightly acid; subacid. Source: Websters Dictionary (01 Mar 1998) |
| semiacidified | Half acidified. Source: Websters Dictionary (01 Mar 1998) |