Definify.com
Webster 1913 Edition
Semidouble
Sem′i-douˊble
,Noun.
(Eccl.)
An office or feast celebrated with less solemnity than the double ones. See , 8.
Double
, Noun.
Semˊi-dou′ble
,Adj.
(Bot.)
Having the outermost stamens converted into petals, while the inner ones remain perfect; – said of a flower.