Source : Webster's Revised Unabridged Dictionary (1913)

Acaleph \Ac"a*leph\, Acalephan \Ac`a*le"phan\n.; pl. {Acalephs},
   {Acalephans}. [See {Acaleph[ae]}.] (Zo["o]l.)
   One of the Acaleph[ae].