Conched

ppl. a. [f. CONCH + -ED².] Having or furnished with a conch (in various senses: see the sb.).

1834.  Ainsworth, Rookwood, I. iv. Its conched water god.

1842.  Prichard, Nat. Hist. Man, 32. Very long ears, conched upon the back.

1845.  Petrie, Eccl. Archit. Irel., II. § 3. 162. The conched semicircular absis at the east end.