ammonite

n fossil of a shell, with a coiled shape 菊石（一种甲壳类动物化石, 壳呈旋卷盘状）.

American football, American Indian (also Amerindian), American plan, Americanism, Americanize, -ise, Amerindian, amethyst, amiability, amiable, amiably, amicability, amicable, amid, amidships, amino acid, amir, amiss, amity, ammeter, ammonia, ammunition, amnesia, amnesty, amoeba (US ameba), amoebic, amok, among, among other things, among others, among(st), amongst, amoral, amorous, amorously, amorousness, amorphous, amortization, -isation, amortize, amortise, amount, amount to,