X

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does X mean? 

• X (noun)
  The noun X has 3 senses:

1. the cardinal number that is the sum of nine and one; the base of the decimal system

2. the 24th letter of the Roman alphabet

3. street names for methylenedioxymethamphetamine

  Familiarity information: X used as a noun is uncommon.

• X (adjective)
  The adjective X has 1 sense:

1. being one more than nine

  Familiarity information: X used as an adjective is very rare.

 Dictionary entry details 

• X (noun)

Sense 1

Meaning:

The cardinal number that is the sum of nine and one; the base of the decimal system

Classified under:

Nouns denoting quantities and units of measure

Synonyms:

10; decade; ten; tenner; X

Hypernyms ("X" is a kind of...):

large integer (an integer equal to or greater than ten)

Sense 2

Meaning:

The 24th letter of the Roman alphabet

Classified under:

Nouns denoting communicative processes and contents

Synonyms:

ex; X

Hypernyms ("X" is a kind of...):

alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)

Holonyms ("X" is a member of...):

Latin alphabet; Roman alphabet (the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe)

Sense 3

Meaning:

Street names for methylenedioxymethamphetamine

Classified under:

Nouns denoting man-made objects

Synonyms:

Adam; cristal; disco biscuit; ecstasy; go; hug drug; X; XTC

Hypernyms ("X" is a kind of...):

MDMA; methylenedioxymethamphetamine (a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States)

• X (adjective)

Sense 1

Meaning:

Being one more than nine

Synonyms:

10; ten; x

Similar:

cardinal (being or denoting a numerical quantity but not order)

 Context examples 

PP4 and PP4-X (Lipocortin family) are similar to lipocortin I and calpactin I. PP4 is also an Annexin family member, Ca(2+)-dependent phospholipid binding proteins located on the plasma membrane cytosolic face.

(Annexin A5 Protein, NCI Thesaurus)

Aldehyde dehydrogenase X, mitochondrial (517 aa, ~57 kDa) is encoded by the human ALDH1B1 gene.

(Aldehyde Dehydrogenase X, Mitochondrial, NCI Thesaurus)

A chromosomal translocation t(X;2)(q11;p23) of this gene and the ALK gene is associated with anaplastic large cell lymphoma.

(MSN wt Allele, NCI Thesaurus)

X 2473.’ That was in all the dailies.

(The Memoirs of Sherlock Holmes, by Sir Arthur Conan Doyle)

A fusion gene that results from a chromosomal translocation t(X;2)(q11;p23) which fuses most of the coding sequence of the MSN gene with the 3' portion of the ALK gene.

(MSN/ALK Fusion Gene, NCI Thesaurus)

People with metabolic syndrome X are at increased risk of diabetes mellitus and diseases of the heart and blood vessels.

(metabolic syndrome X, NCI Dictionary)

One milligram equals approximately 0.015432 grain or 35.274 x 10E-6 ounce.

(Milligram, NCI Thesaurus)

In chemistry, M is the amount of a substance that has 6.023 x 10(23) atoms or molecules of that substance.

(Mole, NCI Dictionary)

Aberrant expression of the gene is observed in T-cell leukemias bearing a t(X;14) translocation.

(MTCP1 wt Allele, NCI Thesaurus)

The finding of a growth smaller than 5 mm x 5 mm that was not present at the previous evaluation.

(Modified Overall Immune Related Response Criterion, New Non-Measurable Lesion, NCI Thesaurus)