Where does “allometrical” come from?

allometrical (English) comes from English metrical, from New Latin metricus, from Latin metrum, from Ancient Greek μέτρον, from Ancient Greek -τρον, from Proto-Hellenic -tron, from Proto-Indo-European -trom, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

Ancestry of “allometrical”, step by step

allometrical traces back through two separate lines of ancestry.

via English metrical

StepLanguageWordMeaning
1Englishmetricalrelating to poetic meter; having a regular...
2New Latinmetricuspertaining to the system based on the meter;...
3Latinmetruma measure
4Ancient Greekμέτρονsomething used to measure: measure, rule, weight;...
5Ancient Greek-τρονForms instrument nouns
6Proto-Hellenic-tronForms instrument nouns from verb stems
7Proto-Indo-European-tromForms nouns denoting a tool or instrument
8Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via English allo

StepLanguageWordMeaning
1EnglishalloAlternative spelling of 'allo
2EnglishallosexualDirected toward or involving another person...
3Englishallo-different, other; isomeric; especially, of amino...
4Ancient Greekἄλλοςother, another, different, else; in combination...
5Ancient GreekκρίνωTo separate, divide, part, distinguish between...
6Proto-Hellenickríňňō
7Proto-Indo-Europeankrinyéti
8Proto-Indo-Europeankrey-to sift, separate, divide
Every word from Proto-Indo-European -tḗr