conical (adj.)

1560s, "pertaining to a cone;" 1610s, "having the form of a cone," from Modern Latin conicus, from Greek konikos "cone-shaped," from konos (see cone).

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).