What term describes a "no-tide" point in an ocean caused by basin resonances and other factors?

The term that describes a "no-tide" point in an ocean caused by basin resonances and other factors is an amphidromic point. Amphidromic points are locations in a tidal wave pattern where the tidal range is effectively zero. This phenomenon occurs due to the interplay of tidal forces and the ocean basin's shape and dimensions, leading to a situation where the tides do not rise or fall at these specific points, despite the influence of tides in surrounding areas.

In essence, amphidromic points are equidistant from points of maximum tidal range, acting as nodes in the tidal wave. Understanding amphidromic points is crucial in tidal studies and navigation since knowing their locations can significantly impact tidal predictions and marine operations.

The other options are associated with tidal phenomena but do not specifically denote a "no-tide" condition. For instance, a tidal bore refers to a tide that causes a sudden and strong surge of water in rivers, while tidal datum refers to a specific reference point used for measuring water levels. Slack water refers to periods of low water movement between high and low tides but does not equate to a permanent no-tide point like an amphidromic point does.