From Wiktionary, the free dictionary
Possibly from tagi- + hilis.
tagihilís (Baybayin spelling ᜆᜄᜒᜑᜒᜎᜒᜐ᜔)
- (geometry, neologism) rhomboid
- del Rosario, Gonsalo (1969) Maugnaying Talasalitaang Pang-agham : Ingles-Pilipino [Correlative Word List for Sciences : English-Filipino] (overall work in English and Tagalog), Manila: National Book Store, Inc., →LCCN, →OL