nyctinasty

== English == === Etymology === From nycti- +‎ -nasty. By surface analysis, nycti- +‎ -nast +‎ -y. === Noun === nyctinasty (uncountable) (botany) The movement of leaves or petals in response to darkness; the closing of a flower at night. Synonyms: nyctinastism, nyctitropism ==== Derived terms ==== nyctinastic ==== Translations ==== === See also === heliotropism === References === Oxford English Dictionary, 2nd ed., 1989.