Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

facultative

play
adjective fac·ul·ta·tive \ˈfa-kəl-ˌtā-tiv, British -tə-tiv\

Definition of facultative

  1. 1 a :  of or relating to the grant of permission, authority, or privilege <facultative legislation> b :  optional

  2. 2 :  of or relating to a mental faculty

  3. 3 a :  taking place under some conditions but not under others <facultative diapause> b :  exhibiting an indicated lifestyle under some environmental conditions but not under others <facultative anaerobes>

facultatively adverb



Medical Dictionary

facultative

play
adjective fac·ul·ta·tive \ˈfak-əl-ˌtāt-iv\

Medical Definition of facultative

  1. 1:  taking place under some conditions but not under others <facultative parasitism>

  2. 2:  exhibiting an indicated lifestyle under some environmental conditions but not under others <facultative anaerobes>

facultatively adverb




Seen and Heard

What made you want to look up facultative? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a timid, meek, or unassertive person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

perplex soothe reduce disapprove
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ