Dictionary

facultative

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

Definition of FACULTATIVE

1
a :  of or relating to the grant of permission, authority, or privilege <facultative legislation>
b :  optional
2
:  of or relating to a mental faculty
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>
fac·ul·ta·tive·ly adverb

First Known Use of FACULTATIVE

1820

facultative

adjective fac·ul·ta·tive \ˈfak-əl-ˌtāt-iv\   (Medical Dictionary)

Medical Definition of FACULTATIVE

1
:  taking place under some conditions but not under others <facultative parasitism>
2
:  exhibiting an indicated lifestyle under some environmental conditions but not under others <facultative anaerobes>
fac·ul·ta·tive·ly adverb

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April 01, 2015
diapause Hear it
a period of physiological dormancy
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