raphe

noun

ra·phe | \ ˈrā-(ˌ)fē

Definition of raphe

1 : the seamlike union of the two lateral halves of a part or organ (such as the tongue) having externally a ridge or furrow

2a : the part of the stalk of an anatropous ovary that is united in growth to the outside covering and forms a ridge along the body of the ovule

b : the median line or slit of the valve of certain diatoms

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The region, known as the dorsal raphe nucleus, or D.R.N., is best known for its link to depression. — Katie Hafner, New York Times, "Researchers Confront an Epidemic of Loneliness," 5 Sep. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'raphe.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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The first known use of raphe was circa 1753

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raphe

noun

ra·phe

variants: also rhaphe \ˈrā-fē

Medical Definition of raphe

: the seamlike union of the two lateral halves of a part or organ (as of the tongue, perineum, or scrotum) having externally a ridge or furrow and internally usually a fibrous connective tissue septum