o-

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Noun

1. A [[blood type]] that has no [[antigen]]s. It lacks the [[A]], [[B]] and [[Rh]] factors on the blood cells. It is the [[universal donor]] for blood and can give blood to any blood type, but can only receive O- blood.

Prefix

1. {{lb|en|organic chemistry}} [[ortho-]]

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.