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Oligospermia
Oligospermia Abnormally low number of sperm in the semen, with resultant relative infertility.
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Sperm
A sperm cell, or spermatozoon (pl. spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. It is carried in fluid called semen, and is capable of fertilising an egg cell to form a zygote. A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female) or "XY" (for a male).
Semen
The fluid containing sperm (the male reproductive cells) that is expelled (ejaculated) through the end of the penis when the man reaches sexual climax (orgasm).
Infertility
The diminished or absent ability to conceive or produce an offspring while sterility is the complete inability to conceive or produce an offspring.
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Oligoarthritis
Inflammation of a few joints - conventionally up to 4 joints. More = 'polyarthritis'.
Oligochromemia
Deficiency of hemoglobin in the blood.
Oligomenorrhea
Light menstrual flow.
Oliguria
A condition characterized by an abnormally small output of urine.
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Opsonin
A substance, usually antibody or complement component, which coats a particle such as a bacterium and enhances phagocytosis by phagocytic cells.
Opsonization
Literally means "preparation for eating". The coating of a bacterium with antibody and/or complement that leads to enhanced phagocytosis of the bacterium by phagocytic cells.
Obscenity
Imagery, ideation, narratives and other representations and actualities which offend and disgust the sensibilities of the perceiver. Imprecisely, the term is used to refer to sexually explicit material or media (SEM), including pornography, and also sexual actions or utterances that are traditionally classified as forbidden. As in erotica, what is perceived as obscene is usually idiosyncratic and is incongruent with the specifications of one's lovemap.
Olfaction
The sensory function of smelling.
Olfactophilia
One of the paraphilias of the fetishistic/talismanic type in which the sexuoerotic stimulus is associated with smell and odors emanating from parts of the body, especially the sexual and adjacent parts.
Oligospermia
Ondinisme
Paraphilia of the fetishistic/talismanic type in which sexuoerotic arousal and facilitation or attainment of orgasm are responsive to, and being urinated upon and/or swallowing urine. There is no technical term for the reciprocal condition of urinating on or in the mouth of the partner. Synonym urolagnia. (adjective, urophilic): the condition of being responsive to or dependent on the smell or taste of urine, or the sight and someone urinating, in order to obtain erotic arousal and facilitate or achieve orgasm.
Ontogeny
In biology, the developmental history of the life span of a single individual or organism, as compared with phylogeny, which is the developmental history of all members of the species.
Opioid
A peptide, naturally occurring in the brain and elsewhere in the body, the effect of which resembles that of opium or a morphine-like synthetic opiate.
Opponent-process theory
A theory proposed by Richard Solomon (1973, 1980) to augment traditional stimulus-response learning theory, according to which powerful aversion or attraction to a particular activity or experience undergoes reversal, as for example, pain reversing into pleasure, tragedy into triumph, terror into euphoria, or the proscribed into the prescribed. Opponent-process theory explains addictions to opioids, alcohol, other drugs, and to the positive and negative affective states of love, fear and anxiety, and behaviors such as exercise and combat of a war or sporting event. The theory explains, in part, the development of the paraphilias and sexuoerotic participation in sadomasochism.
Orchidectomy
Surgical opening of the scrotum and removal of the testicles for testicular cancer, or to remove the major source of testosterone for prostate cancer therapy, or in relatively ineffective attempts of castration to control the sexual behavior of adjudged "sex offenders."
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