or·ni·thine 
(ôrnə-thēn′)
(ôrnə-thēn′)n.
An amino acid, C5H12N2O2, not found in proteins, formed by hydrolyzing arginine and important in the formation of urea.
[ornith(uric acid), an acid found in birds' urine (ORNITH(O)- + URIC ACID) + -INE2.]
- playpen
- play possum
- playroom
- playsuit
- play the devil with
- play the field
- play the fool
- play the game
- play therapist
- play therapy
- plaything
- play up
- play upon
- play up to
- playwear
- play with
- play with a full deck
- play with fire
- play with (oneself)
- play with oneself
- playwright
- playwrighting
- playwriting
- play yard
- plaza