sys·tem·a·tist 
(sĭstə-mə-tĭst, sĭ-stĕmə-)
(sĭstə-mə-tĭst, sĭ-stĕmə-)n.
1. A taxonomist.
2. One who adheres to or formulates a system or systems.
- sidereal
- sidereal day
- sidereal hour
- sidereal month
- sidereal time
- sidereal year
- siderite
- sideritic
- SI-derived unit
- sidero-
- siderochrome
- siderocyte
- siderophile
- siderosis
- sidesaddle
- sideshow
- sideslip
- sidespin
- sidesplitter
- sidesplitting
- sidesplittingly
- sidestep
- sidestepper
- side-straddle hop
- sidestream smoke