cardinal tetra

noun

a small, brilliantly colored red and blue characin fish, Paracheirodon axelrodi, native to tropical forest streams in Brazil and Colombia: a popular aquarium fish.

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WordNet

cardinal tetra
noun
small bright red and blue aquarium fish from streams in Brazil and Colombia

WordNet® 3.0, © 2006 by Princeton University.
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00:10

Cardinal tetra is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Example sentences

Cardinal tetra fish show off the primary-color finery that helps make them popular among aquarium owners.

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"What people don't realize is that intimacy has its conventions as well as ordinary social intercourse. There are three cardinal rules—don't take somebody else's boyfriend unless you've been specifically invited to do so, don't take a drink without being asked, and keep a scrupulous accounting in financial matters."

-W.H. Auden