Forming a succession of curves arranged like the thread of a screw; coiled in a cylindrical or conical manner; helical. In general use.

Formed like a whelk; twisted, convoluted, or ridged like the shell of a whelk.

Of the nature of a screw (in various senses of screw, n.1).

Belonging to or having the form of a helix; screw-shaped; spiral. Also in combinations, as helical gear, helical tube, helical-cut adj.

Winding, spiral. Obsolete. rare.

Resembling a snail-shell, spiral, winding.

Spiral, screw-like.

Having the form of a helix; screw-shaped; spiral. Chiefly in Zoology of shells, and in Botany of forms of inflorescence, etc.

= cochleate, adj.

Formed like a spiral shell; twisted, spiral. (Chiefly Botany.)

= helicoid, adj. 1.