núcleo

n. nucleus, core, kernel; unit, cell, group, team, squad; heart

n. nucleus, kernel; center, core

v. nucleate, create a nucleus

n. heart; center, core; kernel, nucleus

= core, nuclear zone, x-height, centrepoint [centerpoint, -USA], nucleus [nuclei, -pl.], heart, hard core.
Ex: The main list of index terms is the core of the thesaurus and defines the index language.
Ex: A new definition of the nuclear zone of a Bradford curve is proposed.
Ex: Its x-height was notably small, and the fount was equipped with many ligatures (tied letters) and with upright capitals; it was quickly and widely imitated.
Ex: In our capacity as centerpoints for local activities, we may be equipped with card production equipment for producing catalog cards through the state division of OCLC.
Ex: These libraries became the nucleus for many private and religious collections that ultimately became the first public libraries in Brazil.
Ex: A heart on a pink background thus indicates 'romance' (rather than medicine) and a magnifying glass or a gun might indicate a detective story though a gun might mean a 'western' if it is a revolver and a war story if it is a field gun.
Ex: The text describes a 'world science' marked by the collectivization of the centre,'centrality' being defined not by a national monopoly, but by the 'hard core' of a transnational network, stratified on a continental or subcontinental basis = El texto describe una "ciencia mundial" marcada por la colectivización del centro, definiendo la "centralidad" no por monopolio nacional sino por el núcleo de una red internacional, estratificado a nivel continental o subcontinental.
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* en el núcleo = at the core (of).
* formación de un núcleo = nucleation.
* formar el núcleo = form + the nucleus.
* núcleo rural = rural area.

Alma
Core

Iron core