honeycomb

A substance made by bees (clade Anthophila) primarily from beeswax which has hexagonal cells to hold their larvae, and for storing pollen and honey to feed the larvae and themselves when other food is scarce; it is also eaten by humans as part of comb-honey; (countable) a single sheet made up of two layers of this substance.

Something resembling honeycomb (noun sense 1) in having numerous cells or small holes.

A space-filling packing of polytopes in three- or higher-dimensional space.

The texture of the surface of a solar cell, intended to increase its surface area and capture more sunlight.

A defect in a material (especially metal) where small holes are present; specifically (construction), a defect in concrete consisting of numerous voids resulting from the failure of mortar to effectively fill the spaces among coarse aggregate particles.

Material manufactured with small hollow cells, sometimes sandwiched between two flat sheets, which is used to make light, stiff structural components.

Ellipsis of honeycomb stomach (“the reticulum or second compartment of the stomach of a cow or other ruminant”).

Ellipsis of honeycomb work (“especially in Moorish architecture: a form of ceiling ornamentation (especially of an arch or dome) made up of small vaulted arches”).

Something resembling honeycomb in sweetness; hence, something desirable or pleasant.

Used as a term of endearment: honey, sweetheart.