twen·ti·eth 
(twĕntē-ĭth, twŭn-)
(twĕntē-ĭth, twŭn-)n.
1. The ordinal number matching the number 20 in a series.
2. One of 20 equal parts.
twenti·eth adv. & adj.
- sycamore
- syce
- sycee
- syconium
- sycophancy
- sycophant
- sycophantic
- sycophantical
- sycophantically
- sycosis
- Sydenham
- compound
- compoundable
- compound-complex sentence
- compounder
- compound eye
- compound fraction
- compound fracture
- compound gland
- compounding pharmacy
- compound interest
- compound leaf
- compound lens
- compound machine
- compound microscope