Curved.

simple past tense and past participle of arch

(American spelling) Alternative form of archaeology

(ecclesiastical) The rank or office of an archbishop. / (ecclesiastical) The jurisdiction of an archbishop.

Relating to the science or research of archaeology.

A chief magistrate of ancient Athens. / A person who claims the right to rule, or to exercise power or sovereign authority over other human beings. / A ruler, head of state or other leader.

The Arctic Ocean.

The smallest of the five oceans of the Earth, on and around the North Pole, bordered by the three continents of Asia, Europe and North America.

(geology) Period of time determined to exist prior to 2.5 thousand million years ago.

(geology) Of or pertaining to the Archaeozoic.