a. and sb. [ad. Gr. βαλανοειδής, f. βάλανος acorn: see -OID.] A. adj. Acorn-shaped. B. sb. An acorn-shell or balanid.
1869. Nicholson, Zool. (1880), xxxi. 291. The Balanoids are shallow-water forms.
1881. in Syd. Soc. Lex.
