“PIA”

The following 2 entries include the term PIA.

pia mater

noun

: the thin vascular membrane that invests the brain and spinal cord internal to the arachnoid and dura mater

See the full definition

pia family

noun

: taccaceae

See the full definition

Word of the Day

Listen to the pronunciation of ambient

See Definitions and Examples »

Test Your Vocabulary

Fashionable Words

  • dog-sunglasses-scarf
  • Which of these items is named for a deadly weapon?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.

Pick the best words!

PLAY
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Word Game Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
Missing Letter A daily crossword with a twist
naughty or nice
Are you naughty or nice? Quiz He's making a quiz, and checking it twice...