onion - edible bulb of an onion plant

shallot - aggregated bulb of the multiplier onion

squill - bulb of the sea squill, which is sliced, dried, and used as an expectorant

stalk, stem - a slender or elongated structure that supports a plant or fungus or a plant part or plant organ

bulbil, bulblet - small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers

electric lamp - a lamp powered by electricity

filament - a thin wire (usually tungsten) that is heated white hot by the passage of an electric current

mercury thermometer, mercury-in-glass thermometer - thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit; mercury expands with a rise in temperature causing a thin thread of mercury to rise in the tube

portion, part - something less than the whole of a human artifact; "the rear part of the house"; "glue the two parts together"

syringe - a medical instrument used to inject or withdraw fluids

neural structure - a structure that is part of the nervous system

brain stem, brain-stem, brainstem - the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus

respiratory center - the center in the medulla oblongata and pons that integrates sensory information about the level of oxygen and carbon dioxide in the blood and determines the signals to be sent to the respiratory muscles

anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical structure; "he has good bone structure"