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| Description of growth spurt (noun: plural: rowth spurts) a rapid increase in growth which occurs during adolescence Samples of growth spurt Children have a growth spurt around puberty.
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| Description of cation (noun: plural: cations) positively charged ions Samples of cation An ion that has lost electrons is called a cation.
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| Description of enantiomer (noun: plural: enantiomers) either one of a pair of chemical components whose molecular structures have a mirror-image relationship to each other Samples of enantiomer Enantiomers are chiral objects being images which are not overlayed.
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| Description of proton (noun: plural: protons) subatomic particle with one positive charge Samples of proton Protons and neutrons are found in the nucleus of the atom.
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| Description of greenhouse gases (noun: only plural) gases such as carbon dioxide and methane that absorb infrared radiation which warms the atmosphere Samples of greenhouse gases The amount of greenhouse gases in the atmosphere is increasing because of use of fossil fuels and livestock farming.
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| Description of division (noun: plural: divisions) the splitting of the whole into parts Samples of division Cell division occurs during mitosis or meiosis.
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| Description of pituitary gland (noun: plural: pituitary glands) master endocrine gland which is attached to the hypothalamus at the base of the brain Samples of pituitary gland The pituitary gland has an anterior and a posterior lobe and produces the hormones ACTH, LH, FSH, TSH, growth hormone, prolactin, MSH, vasopressin and oxytocin.
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| Description of ear wax (noun: no plural) substance secreted in the outer ear canal by special glands Samples of ear wax The technical name for earwax is cerumen.
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| Description of testicle (noun: plural: testicles) male sex organ found in the scrotum Samples of testicle The testicle consists of the testis, the vasa efferentia and epididymis.
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| Description of keratin (noun: no plural) hard protein found in skin; hair or nails Samples of keratin Keratin is a tough and fibrous protein.
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