perianth
Concise Oxford English Dictionary © 2008 Oxford University Press:
perianth /ˈpɛrɪanθ/
▶noun Botany the outer part of a flower, consisting of the calyx (sepals) and corolla (petals).
– origin C18: from Fr. périanthe, from mod. L. perianthium, from Gk peri ‘around’ + anthos ‘flower’.
'perianth' also found in these Oxford entries:

