neap tide
(nēp)
noun A tide that occurs when the difference between high and low tide is least; the lowest level of high tide. Neap tide comes twice a month, in the first and third quarters of the moon.
(click for a larger image)
neap tide
Neap tides occur when the sun, moon, and earth form a right angle and the gravitational pull of the sun counteracts the pull of the moon.
Learn more about neap tide