SINCE 1828
macrocystis
noun
mac·ro·cys·tis
| \ ˌmakrōˈsistə̇s\
Definition of macrocystis
1
capitalized
: a genus of brown algae (family Laminariaceae) that are often very large and consist of a slender stipe with pinnate fronds and floats — see giant kelp
2
plural macrocystis
: any plant of the genus Macrocystis
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