Of a Hydra: that has heads which grow again after being cut off.

Having a long head. Of a plant, insect, anatomical part, etc.

Of a tree or other plant: having a rounded form or crown, or a rounded flower or seed head. Also in the names of plants having such a characteristic.

Having a woolly head. in specific names of plants.

Having a smooth head. Chiefly in the names of animals, plants, etc.

Of a plant, tree crown, inflorescence, etc.: having loose growth without a compact core or heart.