HELIANTHOID
He`li*an"thoid, a. (Zoöl.)
Defn: Of or pertaining to the Helianthoidea.
HELIANTHOIDEA He`li*an"thoi"de*a, n. pl. Etym: [NL., fr. L. helianthes sunflower + -oid.] (Zoöl.)
Defn: An order of Anthozoa; the Actinaria.
HELICAL
Hel"i*cal, a. Etym: [From Helix.]
Defn: Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. — Hel"i*cal*ly, adv.
HELICHRYSUM
Hel`i*chry"sum (, n. Etym: [L., the marigold, fr. Gr. (Bot.)
Defn: A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called "everlasting flowers."
HELICIFORM
He*lic"i*form, a. Etym: [Helix + -form.]
Defn: Having the form of a helix; spiral.