Pre-eclampsia (also preeclampsia, without hyphen) is the most common term now used in English for this disorder, also known as toxemia of pregnancy, or gravidic toxemia. Preeclampsia and eclampsia are hypertensive disorders of pregancy.

The word "gravidic" means "occurring in pregnancy" or "relating to pregnancy or a pregnant woman." Lots of links to citations for this can be found here: https://medical-dictionary.thefreedictionary.com/gravidic

From a research paper published in the International Journal of Science and Research (IJSR):

"Pre-eclampsia (toxemia of pregnancy, dysgravidia,
eclampticgestosis) represents the first cause of morbidity
and mortality, both maternal and fetal."
https://www.ijsr.net/archive/v10i3/SR21303165813.pdf

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preeclampsia (prē′ĭ-klămp′sē-ə)
n.
A condition of hypertension occurring in pregnancy, typically accompanied by edema and proteinuria. Also called toxemia of pregnancy.

citation:
preeclampsia. (n.d.) The American Heritage® Medical Dictionary. (2007). Retrieved July 17 2021 from https://medical-dictionary.thefreedictionary.com/Preeclampsi...

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reference containing "toxemia, also known as pre-eclampsia or preeclampsia":
https://www.medicinenet.com/toxemia/definition.htm

Preeclampsia is the currently accepted and most preferred medical terminology.

The following terms are used interchangeably and can be considered synonymous but according to some, there are distinctions (usually relating to degree of severity): gestosis, gestational hypertension, pregnancy-induced hypertension (PIH), toxemia, toxemia of pregnancy, gravidic pregnancy, pre-eclampsia

The term "pre-eclampsia" is one specific type of gestosis.


"Three classifications of the American College of Obstetricians and Gynecologists (ACOG), of the Organization of Gestosis (OG) and of the International Society for Study of Hypertension in Pregnancy (ISSHP) differ among one another in some essential points. According to ACOG the term "preeclampsia" means a state with hypertension and albuminuria or edema, according to ISSHP--hypertension and albuminuria. This may lead to serious misunderstanding as many obstetricians use this term to identify a directly threatening eclampsia attack. But the two classifications do not provide a term for such a condition whereas according to OG this state is identified as threatening eclampsia. The OG and ACOG classifications give a classifications according to the progression of the disease, the ISSHP does not give such a classification. ISSHP does not consider edema as a symptom, ACOG takes it into consideration if it is accompanied by hypertension according to OG the very edema not subsiding after relaxation is enough to diagnose gestosis E. ISSHP has introduced the term "hypertension in pregnancy", but also includes one-symptom form "pregnancy albuminuria" not accompanied by hypertension. Such terms suggest lack of etiological relation between those forms, which has not however been proved. The names of one-symptom forms according to OG "gestosis H" and "gestosis P" do not impose such a relation (it is a classification according to symptoms), but they do not exclude it. Contrary to ACOG and OG, ISSHP gives the level of diastolic blood pressure only"
Cretti A. Trzy klasyfíkacje gestozy [3 classifications of gestosis]. Ginekol Pol. 1989 Jan;60(1):47-51. Polish. PMID: 2571548.

Another nice study to understand it:
Retzke U, Graf H. Die neue Terminologie und Klassifikation hypertensiver Erkrankungen in der Schwangerschaft [The new terminology and classification of hypertensive diseases in pregnancy]. Zentralbl Gynakol. 1994;116(2):61-3. German. PMID: 8147190.


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Note added at 1 day 13 hrs (2021-07-18 23:34:50 GMT)
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Preeclampsia is a type of gestosis: EPH-Gestosis or Edema proteinuria hypertension gestosis.

Ps: Preeclampsia - hyphenless according to Merriam-Webster Dictionary.