Wax formerly melted onto a letter to seal it; the picture of the sender's seal was often pressed into the wax as evidence that the letter had not been opened.

Describing a device with seals that activate without special procedures. / Describing a container that is capable of automatically closing off leaks that form in it.

A pressure-sensitive tape used for closing or sealing corrugated fiberboard boxes.

Phoca vitulina, a seal living in the northern Atlantic and Pacific oceans.

plural of sealed beam

(technology) A type of electric lamp for producing a beam of light in which the filament is sealed inside a unit consisting of the reflector and lens so as to ensure the alignment of the beam and to protect the reflector from becoming dirty or tarnished.

plural of harp seal

plural of leopard seal

Third-person singular simple present indicative form of heat-seal

simple past tense and past participle of heat-seal