| ATTOMETRE | • attometre n. (Metrology) An SI unit of length equal to 10-18 metres. Symbol: am. • ATTOMETRE n. ten to the power of minus eighteen metres, also ATTOMETER. |
| CENTIMETRE | • centimetre n. (British spelling, Canadian spelling) (metrology) An SI unit of length equal to 10-2 metres. Symbol: cm. • CENTIMETRE n. one hundredth of a metre, also CENTIMETER. |
| DECAMETRE | • decametre n. (Metrology) An SI unit of length equal to 101 metres. Symbol: dam. • decametre n. (Prosody) A line in a poem having ten metrical feet. • decametre n. (Prosody) A poetic metre in which each line has ten feet. |
| DECIMETRE | • decimetre n. (Metrology) An SI unit of length equal to 10-1 metres. Symbol: dm. • DECIMETRE n. one tenth of a metre, also DECIMETER. |
| DEKAMETRE | • dekametre n. Alternative form of decametre. • DEKAMETRE n. ten meters, also DECAMETER, DECAMETRE, DEKAMETER. |
| EXAMETRE | • exametre n. 1018 metres. • EXAMETRE n. ten to the power of eighteen metres. |
| HECTOMETRE | • hectometre n. (Metrology) An SI unit of length equal to 102 metres. Symbol: hm. • HECTOMETRE n. a measure of length, equal to a hundred meters, also HECTOMETER. |
| KILOMETRE | • kilometre n. (Official BIPM spelling, British spelling, Canadian spelling, Australian, New Zealand, Irish, Indian… • KILOMETRE n. a thousand metres, also KILOMETER. |
| METRE | • metre n. The basic unit of length in the International System of Units (SI: Système International d’Unités)… • metre v. (Britain, rare) Alternative spelling of meter. • metre n. The rhythm or measure in verse and musical composition. |
| MICROMETRE | • micrometre n. An SI/MKS unit of measure, the length of one millionth of a metre. Symbol: µm, um, rm. • MICROMETRE n. a millionth of a metre. |
| MICROMILLIMETRE | • micromillimetre n. Alternative form of micromillimeter. • MICROMILLIMETRE n. a millionth part of a millimetre (now called a nanometre). |
| MILLIMETRE | • millimetre n. An SI/MKS unit of measure, the length of 1⁄1000 of a metre. Symbol: mm. • millimètre n. Rare spelling of millimetre. • MILLIMETRE n. a thousandth part of a metre, also MILLIMETER. |
| MISMETRE | • mismetre v. Alternative form of mismeter. • MISMETRE v. to spoil the metre (of a poem). |
| NANOMETRE | • nanometre n. An SI subunit of length equal to 10-9 metres. Symbol: nm. • NANOMETRE n. a billionth of a metre, also NANOMETER. |
| PETAMETRE | • petametre n. Britain spelling of petameter. • PETAMETRE n. ten to the power of fifteen metres, also PETAMETER. |
| PETRE | • petre n. (Archaic) saltpetre. • Petre prop.n. A surname transferred from the given name. • Petre prop.n. An English barony. |
| PICOMETRE | • picometre n. (Metrology) An SI unit of length equal to 10-12 metres. Symbol: pm. • PICOMETRE n. a trillionth of a metre, also PICOMETER. |
| SALTPETRE | • saltpetre n. (Originally) Potassium nitrate. • saltpetre n. (Uncommon) Sodium nitrate. • saltpetre v. (Transitive) To treat with saltpetre. |
| SUBMILLIMETRE | • submillimetre n. Alternative spelling of submillimeter. • SUBMILLIMETRE n. a microscopic division of a millimetre, also SUBMILLIMETER. |