semis

noun

SEM-eez/ˈsɛmiːz/

2 meanings of semis

1
noun
Plural of semi.
The highway was jammed with semis hauling freight to the port.
She won her quarterfinal easily but went out in the semis.
Note
Geography decides most of these. A street of semis in Britain or Ireland is a row of semi-detached houses; a highway full of semis in the US is heavy truck traffic; Canada and Australia use both. In sport, informally, going out in the semis means losing a semifinal. Slang plurals for semiautomatic guns and for something cruder make the setting worth a glance.
2
SEM-is/ˈsɛmɪs/
nounhistoricalcountable
A small bronze coin of the Roman Republic, worth half an as.
Archaeologists recovered a bronze semis, its face worn almost smooth, from the floor of the shop.
The collector kept a single bronze semis in a velvet-lined box.
Note
Borrowed straight from Latin sēmis, the coin's name forms its own English plural, semises, so two of them are never confused with the trucks and semifinals. It belongs to coin collecting and the history of the Roman Republic, where it is always reckoned against the as, the bronze unit it halves.

semis is a form of semi

semi, noun: A large truck in which a powered cab unit pulls a long, detachable trailer; a tractor-trailer. Full entry

Forms: semisemis plural
Spelling: semi → semis: add -s

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Origin

Borrowed from Latin sēmis.