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a combining form meaning “other,” used in the formation of compound words (allotrope) and in chemistry to denote the more stable of two geometric isomers.
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Historical Examples

allo told me they would never rest till they had taken a tower in open fight.
Puck of Pook’s Hill Rudyard Kipling

He was, and they were also eight fine, big men—old allo and his seven sons.
Where the Pavement Ends John Russell

allo was painted blue, green, and red from his forehead to his ankles.
Puck of Pook’s Hill Rudyard Kipling

Meanwhile the concierge was ‘allo’-ing lustily into the telephone.
The Mountebank William J. Locke

Suddenly, it is recalled to us that we have been, for over half an hour, steering into the radius of the Cunarder’s allo.
Merchantmen-at-Arms David W. Bone

My wantchee catchee you teachee my, allo same same you dancee ta-tao.
Punch, or the London Charivari, Vol. 146, January 28, 1914 Various

My plice ten dollah, by’mby twenty dollah one-piecee time, allo same tango fashion.
Punch, or the London Charivari, Vol. 146, January 28, 1914 Various

So he went out with the allo tribe once again and they led him up a creek to the place where the flying frog lives.
Where the Pavement Ends John Russell

Of course he could not doubt when old allo and all his seven sons assured him positively that the snake was safe as a tame kitten.
Where the Pavement Ends John Russell

The wireless operator now reports that a vessel near at hand has acknowledged the Cunarder’s allo.
Merchantmen-at-Arms David W. Bone

combining form
indicating difference, variation, or opposition: allopathy, allomorph, allophone, allonym

word-forming element meaning “other,” from Greek allo-, comb. form of allos “other, different” (see alias (adv.)).

allo- or all-
pref.

Other; different: allotransplantation.

Isomeric: allomorphism.

allegro