perfoliationn.
/pəˌfəʊlɪˈeɪʃn/, U.S. /pərˌfoʊlɪˈeɪʃ(ə)n/ Botany. Now rare.
The condition of being perfoliate.
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the world > plants > part of plant > leaf > [noun] > with particular position or connection with stem
interfoil1672
perfoliation1855
interleaf1869
underleaf1873
1855 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Involutivus, applied by Candolle..to perfoliation where the two bodies of a leaf contained in the bud roll themselves from without inwards.
1875 Bull. Torrey Bot. Club. 6 68 Siphium perfoliatum, six feet high, stem an inch in diameter and square, cup at perfoliation holding more than a gill.
1880 A. Gray Struct. Bot. iii. §4 107 Uvularia perfoliata..reveals the explanation of the perfoliation: the base of the lower leaves conspicuously surrounds and encloses the stem.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1855