Definition of membranous
1
: of, relating to, or resembling membrane
2
: thin, pliable, and often somewhat transparent
membranous leaves
3
: characterized or accompanied by the formation of a usually abnormal membrane or membranous layer
membranous croup
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Merriam-Webster unabridged
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Time Traveler for membranous
The first known use of membranous was in 1598
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