'tissular' originates from French, specifically the word 'tissulaire', where 'tiss-' (from Old French 'tissu', past participle of 'tisser') meant 'woven' and the suffix '-aire' was an adjectival/formative element.

'tissular' changed from French 'tissulaire' (used in anatomical/histological contexts) and was adopted into English as 'tissular'. The French 'tissu' ("woven") derives from Old French and ultimately from Latin 'texere' meaning 'to weave', which yielded Middle French forms like 'tissu' and then adjectival forms.

Initially connected to the idea of something 'woven' (as in fabric), the sense shifted in biology to denote structures composed of cells—hence the modern meaning 'relating to biological tissue'.