SINCE 1828
sial
noun
si·al
| \ ˈsīˌal\
plural -s
Definition of sial
(Entry 1 of 2)
1
: siliceous or acid igneous rock whether solid or molten
2
: the lighter outer portion of the earth composed mainly of solid or molten rocks rich in silica and alumina — compare sima
sial-
combining form
variants:
or sialo-
Definition of sial- (Entry 2 of 2)
: saliva
sialolith
Keep scrolling for more
Comments on sial
What made you want to look up sial? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Words from Greek and Latin Quiz
-
- Which of the following months comes from a Latin word for “ten”?
Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
-
Words from Greek and Latin Quiz
Finally! A use for those SAT prep classes.
Take the quiz -
Name That Thing: Animal Edition
How many animals can you identify?
Take the quiz -
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Take the quiz -
SCRABBLE® Sprint
SCRABBLE® fans, sharpen your skills!
Play the game
Share sial
Resources for sial