Webster's English Dictionary

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pulvinus

pul.vi.nus \.p*l-'vi--n*s, -'ve--\ \-'vi--.ni-, -'ve--(.)ne-\ n or 
   pul.vi.ni [NL, fr. L, cushion] pl  : a mass of large thin-walled cells 
   surrounding a vascular strand at the b ase of a petiole or petiolule and 
   functioning in turgor movements