Haemolymph

Definition

The fluid equivalent of blood in most invertebrates, including insects and arachnids, which circulates within the hemocoel and is involved in the transport of nutrients, waste products, and hormones.

Etymology

From Greek 'haima', meaning 'blood', and 'lympha', meaning 'water' or 'clear fluid'.

Example

Insects rely on haemolymph to transport nutrients and remove waste products throughout their bodies.

Synonyms

• Invertebrate blood
• Hemolymph

Related Terms

• Hemocoel
• Circulatory system
• Nutrient transport
• Excretion
• Hemocytes

Usage Notes

Haemolymph does not carry oxygen in most insects and arachnids, as they typically rely on their tracheal system for gas exchange.