a. Zool. [f. TROCHUS + -[I]FORM.] Having the form of a trochus or top-shell; top-shaped; = TROCHOID a. 2.
1822. J. Parkinson, Outl. Oryctol., 250. The single trochiform shell, Trochus Anglicanus of Lister.
1875. C. C. Blake, Zool., 257. The shell is ear-shaped, spiral, or trochiform.
