Plumbs

Plumbs is not the standard plural for the fruit commonly called plum; the usual plural is plums. The term also occurs as a form of the verb to plumb and, in some technical contexts, as a plural for a plumb line or plumb bob used in measurement.

Plumb as a noun refers to a lead weight attached to a line used to determine verticality. In that sense, "plumbs" could denote multiple such weights or lines, though plural usage is rare outside specialized writing.

As a verb, to plumb means to measure depth or to determine vertical alignment. The third-person singular present tense is plumbs (he plumbs the depths). The word derives from plumbum, Latin for lead, reflecting the original plumb line's weight.

Fruit context: the edible fruit of the genus Prunus is called plum; the plural is plums. Plums are stone fruits available in many varieties, including European and Japanese types. They are eaten fresh or used in baking, canning, and drying (prunes). They provide dietary fiber, vitamin C, and other nutrients, and storage is improved by refrigeration. The term plumbs should not be used to refer to the fruit.