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The Collaborative International Dictionary
Thyrsoid

Thyrsoid \Thyr"soid\ (th[~e]r"soid), Thyrsoidal \Thyr*soid"al\ (th[~e]r*soid"al), a. [Gr. ?; ? thyrsus + e'i^dos form, shape: cf. F. thyrso["i]de.] Having somewhat the form of a thyrsus.

Wiktionary
thyrsoid

a. Having the approximate form of a thyrsus. alt. Having the approximate form of a thyrsus.