circannual

[ sur-kan-yoo-uhl ]

adjective

, Biology.

1. noting or pertaining to a biological activity or cycle that recurs yearly.

Word History and Origins

Origin of circannual¹

First recorded in 1970–75; circ(a) + annual

Example Sentences

This annual clock is known as the circannual rhythm and is the longer-term cousin of the circadian or daily rhythm which keeps us awake at the right time of day.

From BBC

Thus, entire lines of research were reduced or have essentially stopped - tidal, lunar and circannual rhythms, Sun-compass orientation, photoperiodism, development, ecology and evolution - waiting for new techniques and new findings that will enable them to re-start.

From Scientific American