The Collaborative International Dictionary of English v.0.48:

Acroter \Ac"ro*ter\ ([a^]k`r[-o]*t[~e]r or [.a]*kr[=o]*t[~e]r),
   n. [F. acrot[`e]re. See Acroterium.] (Arch.)
   Same as Acroterium.
   [1913 Webster]