Althaea \Al*th[ae]"a\, Althea \Al*the"a\, n. [althaea, Gr. ?.]

(Bot.)
   (a) A genus of plants of the Mallow family. It includes the officinal marsh mallow, and the garden hollyhocks.
   (b) An ornamental shrub (Hibiscus Syriacus) of the Mallow family. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

althea

Source: WordNet (r) 2.0
 

Althaea \Al*th[ae]"a\, Althea \Al*the"a\, n. [althaea, Gr. ?.]

(Bot.)
   (a) A genus of plants of the Mallow family. It includes the officinal marsh mallow, and the garden hollyhocks.
   (b) An ornamental shrub (Hibiscus Syriacus) of the Mallow family.

Source: Webster's Revised Unabridged Dictionary (1913)