trilobed

Trilobed is an adjective used to describe a shape or structure that is divided into three distinct lobes, or that resembles three rounded projections connected at a common point. The term derives from Latin tri- meaning three and lobus meaning lobe. In biology and botany, trilobed describes morphology with three lobes; the lobes may range from shallow to deep and can be symmetrical or somewhat irregular.

In botany, trilobed is commonly applied to leaves, petals, and sometimes fruits or other organs. Trilobed leaves have three primary lobes, often with a central lobe that is larger, and the lobes may be connected to a single blade or radiate from a common point, as seen in some palmately lobed leaves. The term also appears when describing floral structures in which a corolla or calyx is divided into three projections. In plant identification and classification, trilobed characteristics can help distinguish species or varieties, though lobe depth and shape can vary within a species.

Outside botany, trilobed appears in heraldry and design, where motifs resembling three connected rounded lobes—often called trefoils—are used as symbols or decorative elements. The descriptor may also appear in anatomy or zoology to note structures that present three lobes, though such usage is field-specific and less common.

Overall, trilobed conveys a three-lobed configuration and is frequently contrasted with bilobed (two lobes) and other lobed or entire forms in morphological descriptions. See also: trilobed leaf, lobed leaf, palmately lobed.