| secondary oocyte | <gynaecology> An oocyte which arises from the primary oocyte (which was diploid) after it completes the first meiotic division after the body has become sexually mature. The secondary oocyte eventually divides into the mature egg or ovum (which is haploid) and a polar body (which degenerates), thus ending the second meiotic division. (13 Nov 1997) |
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| secondary palate | The posterior portion of the embryonic palate, which forms from the palatal processes of the embryonic maxilla and develops into the hard palate. (05 Mar 2000) |
| secondary pellagra | Pellagra resulting from any morbid condition that impairs nutrition by increasing the requirement or reducing the available supply of vitamins. (05 Mar 2000) |
| secondary point of ossification | 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) |
| secondary process | In psychoanalysis, the mental process directly related to the learned and acquired functions of the ego and characteristic of conscious and preconscious mental activities; marked by logical thinking and by the tendency to delay gratification by regulation of the discharge of instinctual demands. Compare: primary process. (05 Mar 2000) |
| secondary product | <plant biology> End product of plant cell metabolism, which accumulates in or is secreted from, the cell. Includes anthocyanins, alkaloids, etc. Some are of major economic importance, for example as drugs. In contrast to a primary product that is involved in the vital metabolism of the plant. (18 Nov 1997) |
| secondary pulmonary lobule | A pyramidal mass of lung tissue whose sides are bounded by the incomplete interlobular connective tissue septa and whose base, which is 1 to 2 cm in diameter, usually faces the pleural surface of the lung; lobule's that occupy a more central position in the lung are not well defined and are considered to consist of three to five pulmonary acini with proximate terminal bronchioles. (05 Mar 2000) |
| secondary pyoderma | A pyoderma in which an existing skin lesion (eczema, herpes, seborrheic dermatitis, etc.) becomes secondarily infected. (05 Mar 2000) |
| secondary radiation | Secondary radiation emitted from the interaction of X-rays with matter; generally lower in energy, with a directional distribution which depends on the energy of the incident radiation. Synonym: secondary radiation. (05 Mar 2000) |
| secondary rays | X-ray's generated when primary X-ray's impinge upon matter; scattered radiation. (05 Mar 2000) |
| secondary refractory anaemia | Any persistent anaemia that is successfully treated only by blood transfusions, and that is associated with another condition. (05 Mar 2000) |
| secondary reinforcement | Reinforcement through something which, while it does not satisfy the need directly, has been associated with direct satisfaction of the need, such as the effect on behaviour of a food or beer commercial on television. (05 Mar 2000) |
| secondary renal calculus | A calculus associated with infection and/or obstruction, usually composed of struvite (magnesium ammonium phosphate). Synonym: infection calculus. (05 Mar 2000) |
| secondary renal tubular acidosis | Renal tubular acidosis that may occur as a complication of hypercalcaemic states, hyperglobulinaemic disorders, and in some other chronic renal conditions; a regular component of De Toni-Fanconi syndrome. (05 Mar 2000) |
| secondary retinitis | Retinitis that follows uveal inflammation. (05 Mar 2000) |