| antenatal | (adjective) occurring or existing before birth | Synonyms: antepartum, prenatal |
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| natal | (adjective) relating to or accompanying birth | - |
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| (adjective) of or relating to the buttocks | - |
| natality | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, birthrate, fertility, fertility rate |
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| natation | (noun) the act of someone who floats on the water | Synonyms: floating |
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| natator | (noun) a person who travels through the water by swimming | Synonyms: bather, swimmer |
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| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| neonatal | (adjective) relating to or affecting the infant during the first month after birth | - |
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| perinatal | (adjective) occurring during the period around birth (5 months before and 1 month after) | - |
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| pinata | (noun) plaything consisting of a container filled with toys and candy; suspended from a height for blindfolded children to break with sticks | - |
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| postnatal | (adjective) occurring immediately after birth | Synonyms: postpartum |
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| prenatal | (adjective) occurring or existing before birth | Synonyms: antenatal, antepartum |
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| sanatarium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatorium, sanitarium |
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| sonata | (noun) a musical composition of 3 or 4 movements of contrasting forms | - |
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| supernatant | (adjective) of a liquid; floating on the surface above a sediment or precipitate | - |
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| (noun) the clear liquid that lies above a sediment or precipitate | - |