Dyke/daɪk/ Definition 1 of 3Pro Tip 1/3Flood Protection Used when talking about structures that safeguard against water damage. Residents rely on the dyke to protect their homes. Pro Tip 2/3Technical Term Common in discussions related to civil engineering and environmental management. The engineer's plan includes a dyke to mitigate flood risks. Pro Tip 3/3UK Spelling This spelling is specific to UK English, American English uses 'levee'. The new dyke along the Thames was completed last year.