metra

As a noun tetra

is any of several species of small south american freshwater fish of the family characidae, popular in home aquaria.

As a verb metra is

.

As nouns the difference between petra and metra

is that petra is stone, a weight equal to 14 pounds while metra is the uterus.

As a proper noun Petra

is {{given name|female|from=Ancient Greek}}.

As nouns the difference between metra and metro

is that metra is the uterus while metro is an underground railway.

As an adjective metro is

metropolitan.

As nouns the difference between metra and matra

is that metra is the uterus while matra is a term in Indian music referring to the smallest rhythmic unit of a tala.

As nouns the difference between metrae and metra

is that metrae is irregular plural of metra while metra is the uterus.

As nouns the difference between metra and meta

is that metra is the uterus while meta is boundary marker.

As an adjective meta is

self-referential; at a higher level.

As nouns the difference between metre and metra

is that metre is the basic unit of length in the International System of Units (SI: Système International d'Unités). It is equal to 39⁴⁷/₁₂₇ (approximately 39.37) imperial inches while metra is the uterus.

As a verb metre

is an alternative spelling of lang=en.