a. [f. ECTO- + ETHMOID.] ‘A term for the prefrontal of the fish, or of the lateral ethmoidal mass, with upper and middle turbinals in man’ (Syd. Soc. Lex.).
1882. Parker, in Trans. Linn. Soc., II. III. 171. This is the prefrontal or ectethmoid [bone].
