A particular edible plant, Spinacia oleracea, or its leaves. / Chinese spinach, red spinach (Amaranthus dubius)

Of or pertaining to the spinal cord. / (zoology) (of a frog or other experimental animal) Having a pithed brain, but an intact surgically isolated spinal cord.

(medicine, colloquial) A spinal anesthesia.

(anatomy) A thick, whitish cord of nerve tissue which is a major part of the vertebrate central nervous system. It extends from the brain stem down through the spine, with nerves branching off to various parts of the body.

(anatomy) The vertebral column.

(pathology) A birth defect resulting in a cleft in the spinal column through which the spinal membranes and spinal cord may protrude. It is characterised by hydrocephalus and other neurological disorders.

(anatomy) A spine; the backbone. / (music) One of the quills of a spinet. / (historical) A barrier dividing the Ancient Roman hippodrome longitudinally.

(anatomy) The canal which runs down through the vertebrae and contains the spinal cord and spinal meninges.

(medicine, colloquial) Lumbar puncture (LP).

(US) A common restaurant appetizer made from spinach and another ingredient such as mayonnaise, cream cheese, or sour cream, and usually served with tortilla chips.