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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Merriam-Webster unabridged
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Time Traveler for raphe
The first known use of raphe was circa 1753
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