in botany, a genus of the polyandria monogynia clas. The corolla consists of five petals, and the calyx of five segments; the berry is dry, and round, with five cells, and five valves. There are two species, only one of them, viz. the Europaea, or lime-tree, a native of Britain.

TILLÆA, in botany, a genus of the tetrandria tetragynia clas. The calyx consists of three segments, and the corolla of three equal petals; and there are three capsules containing three seeds. The species are two, none of them natives of Britain.

TILLANDSIA, in botany, a genus of the hexandria monogynia clas. The calyx consists of three persistent segments; the corolla is bell-shaped, with three segments; the capsule has one cell, containing a single pappous seed. There are nine species, none of them natives of Britain.

TILLER of a ship, a strong piece of wood fastened in the head of the rudder, and in small ships and boats called the helm.