The Collaborative International Dictionary
Thyrsoidal
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
thyrsoidal
a. (alternative form of thyrsoid English)