prefix ·Rare ·Advanced level

Definitions

Prefix

1. 1
   In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹² (short scale trillionth or long scale billionth). morpheme
2. 2
   Used to designate sizes, especially, of cells, smaller than those prefixed by nano- or micro-; sized between 0.2 and 2.0 μm. morpheme

Antonyms

All antonyms

tera

Etymology

Borrowed from Spanish pico (“beak, little bit, speck”)

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.