say it: DUH-kweed
duckweed is a noun meaning "any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds". It carries one recorded sense.
any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for duckweed come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.