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serotonin an organic compound found in human and animal tissue that constricts the blood vessels and raises the blood pressure, and that is an important neurotransmitter and hormone.
serous like, pertaining to, containing, or producing serum; thin and watery.
serous fluid any of various bodily fluids resembling blood serum.
serpent a snake.
serpentine1 having a twisting form or movement; snakelike. [2 definitions]
serpentine2 a usu. dark green mineral often used in buildings for decorative purposes.
serpigo a spreading eruption or disease of the skin, such as ringworm.
serrate having a notched or grooved edge; saw-toothed. [2 definitions]
serrated having notches or grooves in the edge, as a knife.
serration the condition of being serrated. [3 definitions]
serried crowded close together, esp. in rows.
serum the thin, watery fluid remaining when the solid components of blood have clotted. [3 definitions]
serum albumin the main protein found in blood plasma, serving to regulate osmotic pressure. [2 definitions]
serum globulin a protein component of blood serum chiefly containing antibodies.
serval a long-legged, spotted African wildcat, about the size of a bobcat.
servant one who works for another, esp. one who does domestic chores. [2 definitions]
servantless combined form of servant.
serve to give aid or help; be of use. [16 definitions]
server someone who serves. [4 definitions]
service the act or an instance of helping. [14 definitions]
serviceable able to be of service; usable. [2 definitions]