| punctate keratoderma | Horny papules over the palms, soles, and digits that develop central plugs; seen commonly in blacks. Synonym: keratoma disseminatum, keratosis punctata. (05 Mar 2000) |
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| punctate parotiditis | Recurrent or chronic parotiditis with terminal sialectasis, giving a punctate pattern on sialography; associated with epithelial hyperplasia of intralobular ducts, atrophy of acini, and lymphocytic infiltration, characteristic in Sjogren's disease. (05 Mar 2000) |
| punctate retinitis | See: retinopathy punctata albescens. (05 Mar 2000) |
| puncticulate | <dermatology> Minutely dotted. (09 Oct 1997) |
| punctiform | Very small but not microscopic, having a diameter of less than 1 mm. Origin: L. Punctum, a point, + forma, shape (05 Mar 2000) |
| punctuation codon | <molecular biology> The three codons, UAA known as ochre, UAG as amber and UGA as opal, that do not code for an amino acid but act as signals for the termination of protein synthesis. They are not represented by any tRNA and termination is catalysed by protein release factors. There are two release factors in E. Coli, RF1 recognises UAA and UAG, RF2 recognises UAA and UGA. Eukaryotes have a single GTP requiring factor, eRF. See: ochre suppressor, amber suppressor. (13 Jan 1998) |
| punctuative | Of or belonging to points of division; relating to punctuation. "The punctuative intonation of feeble cadence." (Rush) Source: Websters Dictionary (01 Mar 1998) |
| punctum | A point. Punctum caecum. [L, blind point. <anatomy> Same as Blind spot, under Blind. Punctum proximum, near point. See Point. Punctum remotum, far point. See Point. <botany> Punctum vegetationis [L, point of vegetation], the terminal cell of a stem, or of a leaf bud, from which new growth originates. Origin: L, a point. Source: Websters Dictionary (01 Mar 1998) |
| punctum caecum | The blind spot in the visual field corresponding to the location of the optic disk. (05 Mar 2000) |
| punctum coxale | The highest point of the crest of the ilium. (05 Mar 2000) |
| punctum dolorosum | See: Valleix's points. (05 Mar 2000) |
| punctum lacrimale | 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) |
| punctum luteum | An oval area of the sensory retina, 3 by 5 mm, temporal to the optic disk corresponding to the posterior pole of the eye; at its centre is the central fovea, which contains only retinal cones. Synonym: area centralis, macula lutea, macular area, punctum luteum, Soemmerring's spot, yellow spot. (05 Mar 2000) |
| 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) |
| 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) |