1. of or relating to lines connecting points of equal depth in a body of water
Usage: technical; oceanography and cartography

Examples

• The isobathic map showed the underwater topography of the continental shelf.
• Oceanographers used isobathic lines to identify deep trenches in the ocean floor.
• The isobathic contours revealed a gradual slope toward the abyssal plain.
• Navigation charts include isobathic markings to help ships avoid shallow waters.