What does anisometric mean?
Anisometric is a technical adjective meaning not isometric — that is, lacking equal dimensions or measurements across different axes. In crystallography it denotes crystals whose three principal axes differ in length, distinguishing them from the equal-axed isometric or cubic system. In sedimentology and biology it describes particles, grains, or cells whose length, width, and thickness are noticeably unequal. The word derives from Greek roots: 'an-' (not) combined with 'isos' (equal) and 'metron' (measure), via the same combining forms that produce 'isometric'. It appears almost exclusively in formal scientific literature — geology papers, mineralogy texts, and morphological studies — where precision about shape matters. Because it is purely descriptive, it carries no positive or negative connotation; it simply signals asymmetry of dimension. Readers encountering it should note its close but distinct neighbour 'anisotropic', which concerns directional variation in physical properties rather than unequal dimensions themselves.
adjectiveNot isometric; having unequal dimensions or measurements along different axes, or (of crystals) differing in length in the three principal directions.
- (Of objects, particles, or organisms) Having unequal dimensions or measurements along different axes; lacking equality of size or proportion.
- (Crystallography) Of crystals: belonging to systems in which the three axes are of unequal lengths, as opposed to isometric (cubic) crystals.
"The anisometric grains gave the rock a distinctly foliated texture under the microscope."
"Sedimentologists classify sand grains as anisometric when their length, width, and thickness differ markedly."
"Under polarized light, the anisometric crystals of the mineral sample revealed their non-cubic symmetry."
In crystallography, calling a crystal 'anisometric' is essentially saying it refuses to be a perfect cube — its three axes simply won't agree on length.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of anisometric
Anisometric comes from Greek-derived components: the prefix 'an-' (from Greek 'anōn'/'ana-', indicating negation) joined to 'isometric', itself formed from Greek 'ísos' (equal) and 'métron' (measure). The term arose within nineteenth-century scientific vocabulary, when crystallographers needed a systematic way to describe crystals outside the isometric (cubic) system. Its cognates include 'isometric', 'isometry', and the broader family of '-metric' terms built on the Greek measure root.
How anisometric is actually used
A technical term used chiefly in geology, crystallography, and biology; rare in everyday speech. It carries no emotional connotation and functions purely descriptively in formal scientific writing.
Easily confused with anisometric
Anisotropic describes material whose properties vary with direction, while anisometric specifically means having unequal dimensions or measurements.
Isometric means having equal dimensions or measurements, which anisometric explicitly negates.