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epigenetics the study of heritable changes in gene function that do not involve a change in DNA sequence.
epiglottis a thin, flexible plate of cartilage at the root of the tongue that, by closing over the glottis, prevents food from entering the windpipe during swallowing.
epigram a short, pithy, often paradoxical sentence. [2 definitions]
epigrammatize to express (an idea, wish, or the like) in the form of an epigram.
epigraph an inscription, esp. when engraved in stone or on a building. [2 definitions]
epigraphic of or related to epigraphs or epigraphy. [2 definitions]
epigraphy the study or deciphering of inscriptions, esp. on ancient coins, stones, and the like. [2 definitions]
epigynous of certain flowers, having all parts attached at or near the top of the ovary.
epilepsy a nervous system disorder that causes repeated lapses in physical or mental function, often including convulsions and unconsciousness.
epileptic of or indicating epilepsy. [3 definitions]
epilimnion the layer of the water of a lake, above the thermocline, that is warmest and contains the most oxygen. (Cf. hypolimnion.)
epilogue a short concluding section to a literary work, often summarizing what later becomes of the characters. [2 definitions]
epinephrine a hormone produced by the adrenal gland that stimulates muscle tissue and raises blood pressure; adrenaline. [2 definitions]
epiphany (cap.) a Christian celebration on January 6 of the revelation of the divinity of Jesus Christ to the Magi. [3 definitions]
epiphenomenon a phenomenon that appears to be related to a more important one. [2 definitions]
epiphyseal of or pertaining to an end of a long bone.
epiphyseal plate the area of growth at each end of the long bones of children and adolescents, also known as the growth plate or physis.
epiphysis the end of a long bone that is separated from the main bone by a layer of cartilage in children but is fused to the main bone in adults.
epiphyte a plant that grows upon another plant but provides its own nutrients, as certain orchids or lichens.
episcopacy government of a church by bishops. [3 definitions]
episcopal of or relating to a bishop or government of a church by bishops. [2 definitions]