nido
/ˈnʌɪdəʊ/Chemistry
adjective
Designating a boron compound in whose molecules boron atoms occupy all vertices but one of a notional triangulated polyhedron; (also) designating the structure of such a compound. Chiefly (with hyphen) as a word-forming element.
Origin
1960s. From classical Latin nīdus nest + -o. Compare arachno, closo.