sepaloid,a.Bot.|ˈsɛpəlɔɪd| [ad.mod.L. sepaloid-eus, f.sepal-um: see sepal and -oid.] Of the nature of or resembling a sepal. 1830Lindley Nat.Syst.Bot. 135 Sepaloid petals.1872Oliver Elem.Bot. ii. 256 Observe..the sepaloid outer and petaloid inner perianth-leaves of Alisma.