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
variants: or sialo-

Definition of sial- (Entry 2 of 2)

: saliva sialolith

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for sial

Noun

German, from New Latin silicium + aluminium

Combining form

New Latin, from Greek, from sialon; akin to Latin spuere to spit

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).

WORD OF THE DAY

to move or proceed with twists and turns

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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

TAKE THE QUIZ
Love words? Need even more definitions?

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