barnyard grass
(Echinochloa crus-galli), coarse annual grass of the family Poaceae (Gramineae) and one of about 20 species comprising the genus Echinochloa. The common name also applies to a similar species, E. muricata, not considered a separate species by some authorities.Barnyard grass is distributed throughout much of North America as a weed in moist cultivated and waste areas. It has been variously known as barn grass and barnyard millet.
- prefabrication
- prefect
- preference
- prefern
- Prefixes used in chemical nomenclature
- Pregl, Fritz
- pregnancy
- prehistoric religion
- prehnite
- Preil, Gabriel
- prelate
- Prelog, Vladimir
- prelude
- premature birth and postmature birth
- Prem Chand
- premenstrual syndrome
- Premier League
- Preminger, Otto
- Premonstratensian
- Prendergast, Maurice Brazil
- Prensa, La
- Prentiss, Elizabeth Payson
- Preobrajenska, Olga
- preparatory school
- Preparedness