| Subject | English | Irish |
| agric. | complex fertiliser | leasachán coimpléascach |
| fin., polit. | complex fluorine salts | salainn choimpléascacha fluairín |
| environ. | complex formation Formation of a complex compound. Also known as complexing or complexation | déanmhaíocht choimpléascach |
| comp., MS | complex number | uimhir choimpléascach (A number in the form a + bi, where a and b are real numbers and i = sqrt(-1) , so that bi is imaginary unless b = 0) |
| agric. | complex of stocks | coimpléasc stoc |
| comp., MS | complex script | script choimpléascach (A language whose characters require ligation or shaping, such as a right-to-left language (Arabic, Persian, Hebrew, and Urdu) or certain South Asian languages) |
| environ. | complexing agent A substance capable of forming a complex compound with another material in solution | oibreán coimpléascach |
| chem. | complexing agent | oibreán coimpléascúcháin |
| environ. | historical complex | coimpléasc stairiúil |
| chem. | inclusion complex | coimpléacs ionclúide |
| med., health., anim.husb. | major histocompatibility complex | príomhchoimpléasc histea-chomhoiriúnachta |
| nat.res., health., anim.husb. | pneumoenteritis complex | plá na n-athchogantach beag |
| market. | specialised complex installations | sainsuiteálacha coimpléascacha |
| health., med. | tuberous sclerosis complex | scléaróis thiúbrach |
| health., med. | tuberous sclerosis complex | galar Bourneville |