| midsagittal plane | A vertical plane through the midline of the body that divides the body into right and left halves. See: Addison's clinical planes. Synonym: midsagittal plane. (05 Mar 2000) |
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| midsagittal section | A cross section attained by slicing in the median plane, actually or through imaging techniques, the body or any part of the body which occupies or crosses the median plane or by slicing any generally symmetrical anatomic structure, such as a finger or a cell, in its midline. Since actual sectioning the median plane results in a right and a left half, an anatomical median section may be a two-dimensional view of the cut surface on the medial aspect of either half. Synonym: midsagittal section. (05 Mar 2000) |
| midsection | A cut or section through the middle of an organ. (05 Mar 2000) |
| midshipman | 1. Formerly, a kind of naval cadet, in a ship of war, whose business was to carry orders, messages, reports, etc, between the officers of the quarter-deck and those of the forecastle, and render other services as required. In the English naval service, the second rank attained by a combatant officer after a term of service as naval cadet. Having served three and a half years in this rank, and passed an examination, he is eligible to promotion to the rank of lieutenant. In the United States navy, the lowest grade of officers in line of promotion, being graduates of the Naval Academy awaiting promotion to the rank of ensign. 2. <zoology> An American marine fish of the genus Porichthys, allied to the toadfish. Cadet midshipman, formerly a title distinguishing a cadet line officer from a cadet engineer at the U. S. Naval Academy. See Cadet. Cadet midshipman, formerly, a naval cadet who had served his time, passed his examinations, and was awaiting promotion; now called, in the United States, midshipman; in England, sublieutenant. Source: Websters Dictionary (01 Mar 1998) |
| midsigmoid sphincter | The physiological sphincter midway in the sigmoid colon. Synonym: iliopelvic sphincter. (05 Mar 2000) |
| midsternum | The middle and largest portion of the sternum, lying between the manubrium superiorly and the xiphoid process inferiorly. Synonym: corpus sterni, gladiolus, mesosternum, midsternum. (05 Mar 2000) |
| midsummer | The middle of summer. <botany> Midsummer daisy, the oxeye daisy. Origin: AS. Midsumor. Source: Websters Dictionary (01 Mar 1998) |