relayer1
/ˌriːˈleɪə/noun
1A person or animal that lays something again. Compare re-lay rare.
2 Railways (originally and chiefly US ). As a mass noun: a length of rail too worn for heavy usage but which is suitable for re-laying on a line with lighter traffic. Chiefly attributive, especially in relayer rail. Now rare.
Origin
Mid 19th century. From re-lay + -er. Compare earlier layer.
relayer2
/ˈriːleɪə/noun
1 Baseball. A fielder who acts as the middle player in a relay play.
2A person who participates in a relay race.
Origin
Early 20th century; earliest use found in Eau Claire (Wisconsin) Leader. From relay + -er.
relayer3
/ˈriːleɪə/noun
A person who or thing which relays something.
Origin
1920s. From relay + -er. Compare French relayeur person in charge of a place for changing horses.