We found one dictionary that defines the word dredgable:

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1. dredgable: Wiktionary

Definitions from Wiktionary (dredgable) ▸ adjective:  Able to be dredged. ▸ Words similar to dredgable ▸ Usage examples for dredgable ▸ Idioms related to dredgable ▸ Wikipedia articles (New!) ▸ Popular nouns described by dredgable ▸ Words that often appear near dredgable ▸ Rhymes of dredgable ▸ Invented words related to dredgable