Definition of seahorse noun from the Oxford Advanced Learner's Dictionary

 

seahorse

 noun
noun
BrE BrE//ˈsiːhɔːs//
 
; NAmE NAmE//ˈsiːhɔːrs//
 
Fish
 
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a small sea fish that swims in a vertical position and has a head that looks like the head of a horse See related entries: Fish