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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]
Episcopalian of, belonging to, or relating to the Episcopal Church. [3 definitions]
episcopate the office, term, or post of a bishop. [3 definitions]
episiotomy an incision of the vulva often made to facilitate childbirth.
episode a single incident or event, or a related group of these, making up a segment in a life or a long narrative. [3 definitions]
episodic pertaining to or characteristic of an episode. [3 definitions]
epistemic of, connected with, or involving knowledge or the process of acquiring knowledge. [2 definitions]
epistemology the branch of philosophy dealing with the origin, nature, and limits of human knowledge. [2 definitions]
epistle a letter, esp. one having a formal subject or tone. [2 definitions]