Umbellularia \Um*bel`lu*la"ri*a\, n. [NL. Umbellule.]

(Zo["o]l.) A genus of deep-sea alcyonaria consisting of a cluster of large flowerlike polyps situated at the summit of a long, slender stem which stands upright in the mud, supported by a bulbous base.

Source: Webster's Revised Unabridged Dictionary (1913)