SG Heritage Dictionary

Word of the Day: Catachrestical

Hydroid [Adjective] Webster's Dictionary 1913

Related to, or resembling, the hydra; of or pertaining to the Hydroidea.

Hydroid [Noun] Webster's Dictionary 1913

One of the Hydroideas.

Hydroidea [Noun plural] Webster's Dictionary 1913

An extensive order of Hydrozoa or Acalephae.

Hydroidic [Adjective] Webster's Dictionary 1828

Denoting a peculiar acid or gaseous substance, produced by the combination of hydrogen and iodine.