tel·e·thon 
(tĕlə-thŏn′)
(tĕlə-thŏn′)n.
A lengthy television program to raise funds for a charity.
[TELE- + (MARA)THON.]
- semicoma
- semicomatose
- semiconducting
- semiconductor
- semiconductor diode
- semiconductor laser
- semiconscious
- semiconsciously
- semiconsciousness
- semiconservative replication
- semidarkness
- semidesert
- semidetached
- semidiameter
- semidiurnal
- semidivine
- semidocumentary
- semidome
- semidomed
- semidry
- semielliptical
- semifinal
- semifinalist
- semifinished
- semiflexible