Newsday.Answers
Daily Newsday Crossword

“Sphere prefix”

The verified answer to the Newsday Crossword clue “Sphere prefix”, with letter-by-letter analysis and the full puzzle context for the Thursday, December 18, 2025 puzzle.

Published · Across · 4 letters

Hints first

Letters 4
First letter I
Last letter O
I ? ? O

A 4-letter across entry from the Thursday puzzle

The Answer

I O N O

The answer to “Sphere prefix” is IONO

Letters 4
Direction Across
Published Dec 18, 2025

Letter analysis: the 4-letter answer

Vowels, consonants, and crossword construction notes
Unique 3 of 4 positions
Vowels 3 75% of word
Consonants 1 non-vowels
First letter I starts with

The clue “Sphere prefix” appeared in the Newsday Crossword on Thursday, December 18, 2025 as a across entry. The verified answer is IONO — a 4-letter word that begins with I and ends with O.

This answer contains 3 vowels and 1 consonant. The Newsday Crossword is published daily by Newsday on Long Island and edited by Stan Newman, whose Saturday Stumper is widely considered one of the toughest mainstream crosswords in print.

Other clues with the answer IONO

IONO has been used as the answer for these Newsday Crossword clues

More clues from the December 18, 2025 puzzle

Thursday Newsday Crossword
View full puzzle
Senseless 5 ℓ · D Port of Yemen 4 ℓ · D Literary count, familiarly 4 ℓ · D Crop up 5 ℓ · D Set sail 6 ℓ · D Adopted name 5 ℓ · A Late night TV host Meyers 4 ℓ · D Half a lithography pair 4 ℓ · D Persian Gulf ruler 4 ℓ · A Misappropriated 6 ℓ · D Reduce, __, recycle 5 ℓ · D Land south of Sicily 5 ℓ · D Lawn improvement process 8 ℓ · D Roman moon goddess 4 ℓ · D Henry Ford contemporary 4 ℓ · A Slurpee cousins 5 ℓ · D Realty parcel 3 ℓ · D Grants entry to 6 ℓ · A Withdraw formally 6 ℓ · D Small denomination 4 ℓ · A

Frequently asked questions about “Sphere prefix”

What is the answer to “Sphere prefix” in the Newsday Crossword?

The verified answer is IONO — a 4-letter word that appeared as a across entry on Thursday, December 18, 2025.

How many letters is the answer to “Sphere prefix”?

The answer IONO contains 4 letters.

Was “Sphere prefix” an across or down clue?

This clue ran as a Across entry.

Is this site affiliated with Newsday?

No. This is an independent fan reference site — we are not affiliated with Newsday. The Newsday Crossword is a trademark of its respective owner. We solve and verify each Newsday Crossword puzzle manually before publishing the answer key.

Sphere prefix — Newsday Crossword Clue Answer | Newsday Crossword Answers