| MAS | magic angle spinning; Manifest Anxiety Scale; maximum average score; McCune-Albright syndrome; mecon... |
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| MASH | mobile Army surgical hospital; multiple automated sample harvester |
| MASU | mobile Army surgical unit |
| MAVIS | mobile artery and vein imaging system |
| MCCU | mobile coronary care unit |
| punctum ossificationis | The site of earliest bone formation via accumulation of osteoblasts within connective tissue (membranous ossification) or of earliest destruction of cartilage prior to onset of ossification (endochondral ossification). Synonym: punctum ossificationis, ossific centre, point of ossification. (05 Mar 2000) |
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| punctum ossificationis primarium | This is the first site where bone begins to form in the shaft of a long bone or in the body of an irregular bone. Synonym: punctum ossificationis primarium, primary point of ossification. (05 Mar 2000) |
| punctum ossificationis secundarium | This is the centre of bone formation appearing later than the punctum ossificationis primarium, usually in epiphysis. Synonym: punctum ossificationis secundarium, secondary point of ossification. (05 Mar 2000) |
| punctum proximum | That point in conjugate focus with the retina when the eye exerts maximal accommodation. Synonym: punctum proximum. (05 Mar 2000) |
| punctum remotum | That point in conjugate focus with the retina when the eye is not accommodating. Synonym: punctum remotum. (05 Mar 2000) |
| punctum vasculosum | One of the minute dots seen on section of the brain, due to small drops of blood at the cut extremities of the arteries. (05 Mar 2000) |
| lacrimal punctum | The minute circular opening of the lacrimal canaliculus, on the margin of each eyelid near the medial commissure. Synonym: punctum lacrimale, lacrimal opening. (05 Mar 2000) |