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CirripedCirripedia
Cirro-cumulus
Cirro-stratus
Cirrobranchiata
cirrocumulus
cirrocumulus cloud
Cirrose
Cirrostomi
cirrostratus
cirrostratus cloud
Cirrous
Cirrus
cirrus cloud
Cirrus Logic
Cirsium
-- Cirsium arvense --
Cirsium discolor
Cirsium eriophorum
Cirsium flodmanii
Cirsium helenioides
Cirsium heterophylum
Cirsium lanceolatum
Cirsium rivulare
Cirsium vulgare
Cirsocele
Cirsoid
Cirsoid aneurism
Cirsotomy
CIS
Cis-
Cisalpine
Cisatlantic
Cirsium arvense
| Noun | 1. |  Cirsium arvense - European thistle naturalized in United States and Canada where it is a pernicious weedSynonyms: Canada thistle, creeping thistle |